Moderate severityNVD Advisory· Published Sep 29, 2020· Updated Aug 4, 2024
Signature Validation Bypass in goxmldsig
CVE-2020-15216
Description
In goxmldsig (XML Digital Signatures implemented in pure Go) before version 1.1.0, with a carefully crafted XML file, an attacker can completely bypass signature validation and pass off an altered file as a signed one. A patch is available, all users of goxmldsig should upgrade to at least revision f6188febf0c29d7ffe26a0436212b19cb9615e64 or version 1.1.0
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/russellhaering/goxmldsigGo | < 1.1.0 | 1.1.0 |
Affected products
1- Range: < 1.1.0
Patches
1f6188febf0c2Validate the shape of a signature object prior to unmarshalling the Signature
2 files changed · +216 −8
validate.go+31 −8 modified@@ -21,6 +21,7 @@ var ( // ErrMissingSignature indicates that no enveloped signature was found referencing // the top level element passed for signature verification. ErrMissingSignature = errors.New("Missing signature referencing the top-level element") + ErrInvalidSignature = errors.New( "Invalid Signature") ) type ValidationContext struct { @@ -296,20 +297,42 @@ func contains(roots []*x509.Certificate, cert *x509.Certificate) bool { return false } +// In most places, we use etree Elements, but while deserializing the Signature, we use +// encoding/xml unmarshal directly to convert to a convenient go struct. This presents a problem in some cases because +// when an xml element repeats under the parent, the last element will win and/or be appended. We need to assert that +// the Signature object matches the expected shape of a Signature object. +func validateShape(signatureEl *etree.Element) error { + children := signatureEl.ChildElements() + + childCounts := map[string]int{} + for _, child := range children { + childCounts[child.Tag]++ + } + + validateCount := childCounts[SignedInfoTag] == 1 && childCounts[KeyInfoTag] <= 1 && childCounts[SignatureValueTag] == 1 + if !validateCount { + return ErrInvalidSignature + } + return nil +} + // findSignature searches for a Signature element referencing the passed root element. -func (ctx *ValidationContext) findSignature(el *etree.Element) (*types.Signature, error) { - idAttr := el.SelectAttr(ctx.IdAttribute) +func (ctx *ValidationContext) findSignature(root *etree.Element) (*types.Signature, error) { + idAttr := root.SelectAttr(ctx.IdAttribute) if idAttr == nil || idAttr.Value == "" { return nil, errors.New("Missing ID attribute") } var sig *types.Signature // Traverse the tree looking for a Signature element - err := etreeutils.NSFindIterate(el, Namespace, SignatureTag, func(ctx etreeutils.NSContext, el *etree.Element) error { - + err := etreeutils.NSFindIterate(root, Namespace, SignatureTag, func(ctx etreeutils.NSContext, signatureEl *etree.Element) error { + err := validateShape(signatureEl) + if err != nil { + return err + } found := false - err := etreeutils.NSFindChildrenIterateCtx(ctx, el, Namespace, SignedInfoTag, + err = etreeutils.NSFindChildrenIterateCtx(ctx, signatureEl, Namespace, SignedInfoTag, func(ctx etreeutils.NSContext, signedInfo *etree.Element) error { detachedSignedInfo, err := etreeutils.NSDetatch(ctx, signedInfo) if err != nil { @@ -355,8 +378,8 @@ func (ctx *ValidationContext) findSignature(el *etree.Element) (*types.Signature return fmt.Errorf("invalid CanonicalizationMethod on Signature: %s", c14NAlgorithm) } - el.RemoveChild(signedInfo) - el.AddChild(canonicalSignedInfo) + signatureEl.RemoveChild(signedInfo) + signatureEl.AddChild(canonicalSignedInfo) found = true @@ -372,7 +395,7 @@ func (ctx *ValidationContext) findSignature(el *etree.Element) (*types.Signature // Unmarshal the signature into a structured Signature type _sig := &types.Signature{} - err = etreeutils.NSUnmarshalElement(ctx, el, _sig) + err = etreeutils.NSUnmarshalElement(ctx, signatureEl, _sig) if err != nil { return err }
validate_test.go+185 −0 modified@@ -203,3 +203,188 @@ func TestValidateWithEmptySignatureReference(t *testing.T) { require.NoError(t, err) require.NotEmpty(t, el) } + +const ( + validateCert = ` +-----BEGIN CERTIFICATE----- +MIIDnjCCAoagAwIBAgIGAXHxS90vMA0GCSqGSIb3DQEBCwUAMIGPMQswCQYDVQQG +EwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNj +bzENMAsGA1UECgwET2t0YTEUMBIGA1UECwwLU1NPUHJvdmlkZXIxEDAOBgNVBAMM +B2FzYS1kZXYxHDAaBgkqhkiG9w0BCQEWDWluZm9Ab2t0YS5jb20wHhcNMjAwNTA3 +MjIzOTEzWhcNMzAwNTA3MjI0MDEzWjCBjzELMAkGA1UEBhMCVVMxEzARBgNVBAgM +CkNhbGlmb3JuaWExFjAUBgNVBAcMDVNhbiBGcmFuY2lzY28xDTALBgNVBAoMBE9r +dGExFDASBgNVBAsMC1NTT1Byb3ZpZGVyMRAwDgYDVQQDDAdhc2EtZGV2MRwwGgYJ +KoZIhvcNAQkBFg1pbmZvQG9rdGEuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8A +MIIBCgKCAQEAqlQF++AiiKrOb5MVwN8YEgFCbOdLSO44hcJq2BYZYRd1oq1XVnz7 +fVC49YgPXRafpXJx4v8jWyRQug2Sv4nEMvsbVzrV9N09/RHQ1MVa4QlTUEAhR0nS +zs897k2e6zObf/zx5ugE+GLx03+chYFVv1ICup0e0pRNS6OWHYFzZnLTlCEgAbay +HkbA82EViqgWD53BNQLvsS06WztF4pGISyxZ2NpycV5ejmI3ZSr6+bKXcgNAWr7i +nNBUaOwJG52/NlBAKaMq56Bljsni6YmZ/9V2DbQgTHSn4mu+++4FdDtFxBe1ZPID +JpjguXf9X183H7ZIkNOxkr+YlW02uzOpBQIDAQABMA0GCSqGSIb3DQEBCwUAA4IB +AQBRX6NORxMS4cDWkG/PqlYcCjgwZA/8rd6dBkI+wJEzqrXmO1SSIQW6F48ahDVq +T0nicDYSnTkplIbKmooKjm2kkuCIjLwDiLldpZZ/Hpdj9rGDLC2jS6m3dr6OQvoT +DYPOXfrgMykc5VM+h9yx+iYbrilmmrhOwIPxxZDVUiRSB6Op716xk+9d0jlyrtFF +77B3YlKgMThQG6rguXViSwmViywWx+UQD6F1OzES8hoL54hfriOnlIpzZeamtJCo +/jcdeqYHi3ru+uHOBe91GFPtoDGCVuk7YvzlXKMdgyDx82+kRSnLWYMxaI2zleFY +nXHhoQk3K5iSdQT/gFgKJk89 +-----END CERTIFICATE-----` +) + +func TestValidateWithValid(t *testing.T) { + doc := etree.NewDocument() + err := doc.ReadFromBytes([]byte(validExample)) + require.NoError(t, err) + + block, _ := pem.Decode([]byte(validateCert)) + cert, err := x509.ParseCertificate(block.Bytes) + require.NoError(t, err, "couldn't parse okta cert pem block") + + certStore := MemoryX509CertificateStore{ + Roots: []*x509.Certificate{cert}, + } + vc := NewDefaultValidationContext(&certStore) + + el, err := vc.Validate(doc.Root()) + require.NoError(t, err) + require.NotEmpty(t, el) +} + + +func TestValidateWithModified(t *testing.T) { + doc := etree.NewDocument() + err := doc.ReadFromBytes([]byte(modifiedToBeTodd)) + require.NoError(t, err) + + block, _ := pem.Decode([]byte(validateCert)) + cert, err := x509.ParseCertificate(block.Bytes) + require.NoError(t, err, "couldn't parse okta cert pem block") + + certStore := MemoryX509CertificateStore{ + Roots: []*x509.Certificate{cert}, + } + vc := NewDefaultValidationContext(&certStore) + + _, err = vc.Validate(doc.Root()) + require.Error(t, err) +} + + +func TestValidateWithModifiedAndSignatureEdited(t *testing.T) { + doc := etree.NewDocument() + err := doc.ReadFromBytes([]byte(spoofedAsTodd)) + require.NoError(t, err) + + block, _ := pem.Decode([]byte(validateCert)) + cert, err := x509.ParseCertificate(block.Bytes) + require.NoError(t, err, "couldn't parse okta cert pem block") + + certStore := MemoryX509CertificateStore{ + Roots: []*x509.Certificate{cert}, + } + vc := NewDefaultValidationContext(&certStore) + + _, err = vc.Validate(doc.Root()) + require.Error(t, err) +} + +const ( + validExample = `<?xml version="1.0" encoding="UTF-8"?><saml2p:Response Destination="https://dev.sudo.wtf:8443/v1/_saml_callback" ID="id149481635007085371203272055" InResponseTo="_ffea96b1-44a2-4a86-9683-45807984ab5b" IssueInstant="2020-09-01T17:51:12.176Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:xs="http://www.w3.org/2001/XMLSchema"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exkrfkzzb7NyB3UeP0h7</saml2:Issuer><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id149481635007085371203272055"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><ec:InclusiveNamespaces PrefixList="xs" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transform></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>LwRDkrPmsTcUa++BIS5VJIANUlZN7zzdtjLfxfLAWds=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>UyjNRj9ZFbhApPhWEuVG26yACVqd25uyRKalSpp6XCdjrqKjI8Fmx7Q/IFkk5M755cxyFCQGttxThR6IPBk4Kp5OG2qGKXNHt7OQ8mumSLqWZpBJbmzNIKyG3nWlFoLVCoWPtBTd2gZM0aHOQp1JKa1birFBp2NofkEXbLeghZQ2YfCc4m8qgpZW5k/Itc0P/TVIkvPInjdSMyjm/ql4FUDO8cMkExJNR/i+GElW8cfnniWGcDPSiOqfIjLEDvZouXC7F1v5Wa0SmIxg7NJUTB+g6yrDN15VDq3KbHHTMlZXOZTXON2mBZOj5cwyyd4uX3aGSmYQiy/CGqBdqxrW2A==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDnjCCAoagAwIBAgIGAXHxS90vMA0GCSqGSIb3DQEBCwUAMIGPMQswCQYDVQQGEwJVUzETMBEG +A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU +MBIGA1UECwwLU1NPUHJvdmlkZXIxEDAOBgNVBAMMB2FzYS1kZXYxHDAaBgkqhkiG9w0BCQEWDWlu +Zm9Ab2t0YS5jb20wHhcNMjAwNTA3MjIzOTEzWhcNMzAwNTA3MjI0MDEzWjCBjzELMAkGA1UEBhMC +VVMxEzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDVNhbiBGcmFuY2lzY28xDTALBgNVBAoM +BE9rdGExFDASBgNVBAsMC1NTT1Byb3ZpZGVyMRAwDgYDVQQDDAdhc2EtZGV2MRwwGgYJKoZIhvcN +AQkBFg1pbmZvQG9rdGEuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqlQF++Ai +iKrOb5MVwN8YEgFCbOdLSO44hcJq2BYZYRd1oq1XVnz7fVC49YgPXRafpXJx4v8jWyRQug2Sv4nE +MvsbVzrV9N09/RHQ1MVa4QlTUEAhR0nSzs897k2e6zObf/zx5ugE+GLx03+chYFVv1ICup0e0pRN +S6OWHYFzZnLTlCEgAbayHkbA82EViqgWD53BNQLvsS06WztF4pGISyxZ2NpycV5ejmI3ZSr6+bKX +cgNAWr7inNBUaOwJG52/NlBAKaMq56Bljsni6YmZ/9V2DbQgTHSn4mu+++4FdDtFxBe1ZPIDJpjg +uXf9X183H7ZIkNOxkr+YlW02uzOpBQIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQBRX6NORxMS4cDW +kG/PqlYcCjgwZA/8rd6dBkI+wJEzqrXmO1SSIQW6F48ahDVqT0nicDYSnTkplIbKmooKjm2kkuCI +jLwDiLldpZZ/Hpdj9rGDLC2jS6m3dr6OQvoTDYPOXfrgMykc5VM+h9yx+iYbrilmmrhOwIPxxZDV +UiRSB6Op716xk+9d0jlyrtFF77B3YlKgMThQG6rguXViSwmViywWx+UQD6F1OzES8hoL54hfriOn +lIpzZeamtJCo/jcdeqYHi3ru+uHOBe91GFPtoDGCVuk7YvzlXKMdgyDx82+kRSnLWYMxaI2zleFY +nXHhoQk3K5iSdQT/gFgKJk89</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2p:Status xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></saml2p:Status><saml2:Assertion ID="id149481635007855341483658231" IssueInstant="2020-09-01T17:51:12.176Z" Version="2.0" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xs="http://www.w3.org/2001/XMLSchema"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exkrfkzzb7NyB3UeP0h7</saml2:Issuer><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id149481635007855341483658231"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><ec:InclusiveNamespaces PrefixList="xs" xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#"/></ds:Transform></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>nrIzAXSDsFwgvCm+ulbqfqZylzPxCBof6FYDcCEPdCQ=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>en3gX+6oIzNnkUWPbIAZp3rX8kHelobV3qqNSQ/JXQAZX7Up42D1pU6dWNc68xLe7RCDr3xV6zFG2bpi+NyZlsmqyKIXot5W6cM0BKkmRxQDcR1ThwP/VrFQ2HRxKTDUNeNCkTGBDfbwyD+w9RuCZO5JP2DX7DBHFBaTQQ+/9EhPSEx6yvJ05CwJ8eoNd/0ib+FCF1VDn9haP0viA8cOg3ApMkpwJsPXvMpb6U/q1tGgtzcyvqYDfAkWYGG0YPk3BsTUhSa7dN/ZI6O+7ZDGtWQohhYCAXBShrM7OWwJBDA5J+AXo7wFWKMt36u+MqGu2hBC58t7NpkZXehBRhvmmg==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDnjCCAoagAwIBAgIGAXHxS90vMA0GCSqGSIb3DQEBCwUAMIGPMQswCQYDVQQGEwJVUzETMBEG +A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU +MBIGA1UECwwLU1NPUHJvdmlkZXIxEDAOBgNVBAMMB2FzYS1kZXYxHDAaBgkqhkiG9w0BCQEWDWlu +Zm9Ab2t0YS5jb20wHhcNMjAwNTA3MjIzOTEzWhcNMzAwNTA3MjI0MDEzWjCBjzELMAkGA1UEBhMC +VVMxEzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDVNhbiBGcmFuY2lzY28xDTALBgNVBAoM +BE9rdGExFDASBgNVBAsMC1NTT1Byb3ZpZGVyMRAwDgYDVQQDDAdhc2EtZGV2MRwwGgYJKoZIhvcN +AQkBFg1pbmZvQG9rdGEuY29tMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqlQF++Ai +iKrOb5MVwN8YEgFCbOdLSO44hcJq2BYZYRd1oq1XVnz7fVC49YgPXRafpXJx4v8jWyRQug2Sv4nE +MvsbVzrV9N09/RHQ1MVa4QlTUEAhR0nSzs897k2e6zObf/zx5ugE+GLx03+chYFVv1ICup0e0pRN +S6OWHYFzZnLTlCEgAbayHkbA82EViqgWD53BNQLvsS06WztF4pGISyxZ2NpycV5ejmI3ZSr6+bKX +cgNAWr7inNBUaOwJG52/NlBAKaMq56Bljsni6YmZ/9V2DbQgTHSn4mu+++4FdDtFxBe1ZPIDJpjg +uXf9X183H7ZIkNOxkr+YlW02uzOpBQIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQBRX6NORxMS4cDW +kG/PqlYcCjgwZA/8rd6dBkI+wJEzqrXmO1SSIQW6F48ahDVqT0nicDYSnTkplIbKmooKjm2kkuCI +jLwDiLldpZZ/Hpdj9rGDLC2jS6m3dr6OQvoTDYPOXfrgMykc5VM+h9yx+iYbrilmmrhOwIPxxZDV +UiRSB6Op716xk+9d0jlyrtFF77B3YlKgMThQG6rguXViSwmViywWx+UQD6F1OzES8hoL54hfriOn +lIpzZeamtJCo/jcdeqYHi3ru+uHOBe91GFPtoDGCVuk7YvzlXKMdgyDx82+kRSnLWYMxaI2zleFY +nXHhoQk3K5iSdQT/gFgKJk89</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">phoebe.yu@okta.com</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData InResponseTo="_ffea96b1-44a2-4a86-9683-45807984ab5b" NotOnOrAfter="2020-09-01T17:56:12.176Z" Recipient="https://dev.sudo.wtf:8443/v1/_saml_callback"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2020-09-01T17:46:12.176Z" NotOnOrAfter="2020-09-01T17:56:12.176Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>https://dev.sudo.wtf:8443/v1/teams/asa</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2020-09-01T17:25:30.851Z" SessionIndex="_ffea96b1-44a2-4a86-9683-45807984ab5b" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement><saml2:AttributeStatement xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Attribute Name="FirstName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">Phoebe</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="LastName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">Yu</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="Email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">phoebe.yu@okta.com</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="Login" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">phoebe.yu@okta.com</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="SSHUserName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"/></saml2:Attribute></saml2:AttributeStatement></saml2:Assertion></saml2p:Response>` + modifiedToBeTodd = `<?xml version="1.0" encoding="UTF-8"?><saml2p:Response Destination="https://dev.sudo.wtf:8443/v1/_saml_callback" ID="id149481635007085371203272055" InResponseTo="_ffea96b1-44a2-4a86-9683-45807984ab5b" IssueInstant="2020-09-01T17:51:12.176Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:xs="http://www.w3.org/2001/XMLSchema"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exkrfkzzb7NyB3UeP0h7</saml2:Issuer><ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id149481635007085371203272055"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><ec:InclusiveNamespaces PrefixList="xs" 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xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>https://dev.sudo.wtf:8443/v1/teams/asa</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2020-09-01T17:25:30.851Z" SessionIndex="_ffea96b1-44a2-4a86-9683-45807984ab5b" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement><saml2:AttributeStatement xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Attribute Name="FirstName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">Phoebe</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="LastName" 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xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id149481635007855341483658231"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><ec:InclusiveNamespaces xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="xs"/></ds:Transform></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>nrIzAXSDsFwgvCm+ulbqfqZylzPxCBof6FYDcCEPdCQ=</ds:DigestValue></ds:Reference></ds:SignedInfo></dsx:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress">todd@okta.com</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData InResponseTo="_ffea96b1-44a2-4a86-9683-45807984ab5b" NotOnOrAfter="2020-09-01T17:56:12.176Z" Recipient="https://dev.sudo.wtf:8443/v1/_saml_callback"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2020-09-01T17:46:12.176Z" NotOnOrAfter="2020-09-01T17:56:12.176Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>https://dev.sudo.wtf:8443/v1/teams/asa</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2020-09-01T17:25:30.851Z" SessionIndex="_ffea96b1-44a2-4a86-9683-45807984ab5b" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement><saml2:AttributeStatement xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Attribute Name="FirstName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">Phoebe</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="LastName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">Yu</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="Email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">phoebe.yu@okta.com</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="Login" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string">phoebe.yu@okta.com</saml2:AttributeValue></saml2:Attribute><saml2:Attribute Name="SSHUserName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified"><saml2:AttributeValue xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"/></saml2:Attribute></saml2:AttributeStatement></saml2:Assertion></saml2p:Response>` +)
Vulnerability mechanics
Generated by null/stub on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.
References
10- github.com/advisories/GHSA-q547-gmf8-8jr7ghsaADVISORY
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUH33FPUXED3FHYL25BJOQPRKFGPOMS2/mitrevendor-advisoryx_refsource_FEDORA
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZECBFD4M4PHBMBOCMSQ537NOU37QOVWP/mitrevendor-advisoryx_refsource_FEDORA
- nvd.nist.gov/vuln/detail/CVE-2020-15216ghsaADVISORY
- github.com/russellhaering/goxmldsig/commit/f6188febf0c29d7ffe26a0436212b19cb9615e64ghsax_refsource_MISCWEB
- github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7ghsax_refsource_CONFIRMWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GUH33FPUXED3FHYL25BJOQPRKFGPOMS2ghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZECBFD4M4PHBMBOCMSQ537NOU37QOVWPghsaWEB
- pkg.go.dev/github.com/russellhaering/goxmldsigghsax_refsource_MISCWEB
- pkg.go.dev/vuln/GO-2020-0050ghsaWEB
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