pam_usb: getenv() used in PAM context allows environment variable injection into local-check logic
Description
pam_usb provides hardware authentication for Linux using removable media. In versions prior to 0.9.2, getenv() environment variables XRDP_SESSION, DISPLAY and TMUX allow environment variable injection into local-check logic. These environment variables influence whether a current session is local or remote, and a PAM module that runs in the context of setuid binaries (sudo, su), getenv() returns attacker-controlled values whenever the process environment has been manipulated by a local user. This issue has been fixed in version 0.9.2.
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Affected products
1Patches
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
2- github.com/mcdope/pam_usb/releases/tag/0.9.2mitrex_refsource_MISC
- github.com/mcdope/pam_usb/security/advisories/GHSA-qr83-mf3h-fvqrmitrex_refsource_CONFIRM
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