Arbitrary File Write via artifact extraction in actions/artifact

@@ -1,6 +1,6 @@
 {
   "name": "@actions/artifact",
-  "version": "2.1.6",
+  "version": "2.1.7",
   "preview": true,
   "description": "Actions artifact lib",
   "keywords": [

@@ -1,12 +1,12 @@
 {
   "name": "@actions/artifact",
-  "version": "2.1.5",
+  "version": "2.1.7",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@actions/artifact",
-      "version": "2.1.5",
+      "version": "2.1.7",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.0",
@@ -1738,9 +1738,9 @@
       "integrity": "sha512-isyNax3wXoKaulPDZWHQqbmIx1k2tb9fb3GGDBRxCscfYV2Ch7WxPArBsFEG8s/safwXTT7H4QGhaIkTp9447w=="
     },
     "node_modules/unzip-stream": {
-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/unzip-stream/-/unzip-stream-0.3.1.tgz",
-      "integrity": "sha512-RzaGXLNt+CW+T41h1zl6pGz3EaeVhYlK+rdAap+7DxW5kqsqePO8kRtWPaCiVqdhZc86EctSPVYNix30YOMzmw==",
+      "version": "0.3.4",
+      "resolved": "https://registry.npmjs.org/unzip-stream/-/unzip-stream-0.3.4.tgz",
+      "integrity": "sha512-PyofABPVv+d7fL7GOpusx7eRT9YETY2X04PhwbSipdj6bMxVCFJrr+nm0Mxqbf9hUiTin/UsnuFWBXlDZFy0Cw==",
       "dependencies": {
         "binary": "^0.3.0",
         "mkdirp": "^0.5.1"

@@ -1,5 +1,9 @@
 # @actions/artifact Releases
 
+### 2.1.7
+
+- Update unzip-stream dependency and reverted to using `unzip.Extract()`
+
 ### 2.1.6
 
 - Will retry on invalid request responses.

@@ -1,7 +1,4 @@
 import fs from 'fs/promises'
-import * as stream from 'stream'
-import {createWriteStream} from 'fs'
-import * as path from 'path'
 import * as github from '@actions/github'
 import * as core from '@actions/core'
 import * as httpClient from '@actions/http-client'
@@ -47,11 +44,6 @@ async function streamExtract(url: string, directory: string): Promise<void> {
       await streamExtractExternal(url, directory)
       return
     } catch (error) {
-      if (error.message.includes('Malformed extraction path')) {
-        throw new Error(
-          `Artifact download failed with unretryable error: ${error.message}`
-        )
-      }
       retryCount++
       core.debug(
         `Failed to download artifact after ${retryCount} retries due to ${error.message}. Retrying in 5 seconds...`
@@ -86,8 +78,6 @@ export async function streamExtractExternal(
     }
     const timer = setTimeout(timerFn, timeout)
 
-    const createdDirectories = new Set<string>()
-    createdDirectories.add(directory)
     response.message
       .on('data', () => {
         timer.refresh()
@@ -99,46 +89,8 @@ export async function streamExtractExternal(
         clearTimeout(timer)
         reject(error)
       })
-      .pipe(unzip.Parse())
-      .pipe(
-        new stream.Transform({
-          objectMode: true,
-          transform: async (entry, _, callback) => {
-            const fullPath = path.normalize(path.join(directory, entry.path))
-            if (!directory.endsWith(path.sep)) {
-              directory += path.sep
-            }
-            if (!fullPath.startsWith(directory)) {
-              reject(new Error(`Malformed extraction path: ${fullPath}`))
-            }
-
-            if (entry.type === 'Directory') {
-              if (!createdDirectories.has(fullPath)) {
-                createdDirectories.add(fullPath)
-                await resolveOrCreateDirectory(fullPath).then(() => {
-                  entry.autodrain()
-                  callback()
-                })
-              } else {
-                entry.autodrain()
-                callback()
-              }
-            } else {
-              core.info(`Extracting artifact entry: ${fullPath}`)
-              if (!createdDirectories.has(path.dirname(fullPath))) {
-                createdDirectories.add(path.dirname(fullPath))
-                await resolveOrCreateDirectory(path.dirname(fullPath))
-              }
-
-              const writeStream = createWriteStream(fullPath)
-              writeStream.on('finish', callback)
-              writeStream.on('error', reject)
-              entry.pipe(writeStream)
-            }
-          }
-        })
-      )
-      .on('finish', async () => {
+      .pipe(unzip.Extract({path: directory}))
+      .on('close', () => {
         clearTimeout(timer)
         resolve()
       })

@@ -200,14 +200,12 @@ describe('download-artifact', () => {
         }
       )
 
-      await expect(
-        downloadArtifactPublic(
-          fixtures.artifactID,
-          fixtures.repositoryOwner,
-          fixtures.repositoryName,
-          fixtures.token
-        )
-      ).rejects.toBeInstanceOf(Error)
+      const response = await downloadArtifactPublic(
+        fixtures.artifactID,
+        fixtures.repositoryOwner,
+        fixtures.repositoryName,
+        fixtures.token
+      )
 
       expect(downloadArtifactMock).toHaveBeenCalledWith({
         owner: fixtures.repositoryOwner,
@@ -223,6 +221,16 @@ describe('download-artifact', () => {
       expect(mockGetArtifactMalicious).toHaveBeenCalledWith(
         fixtures.blobStorageUrl
       )
+
+      // ensure path traversal was not possible
+      expect(
+        fs.existsSync(path.join(fixtures.workspaceDir, 'x/etc/hosts'))
+      ).toBe(true)
+      expect(
+        fs.existsSync(path.join(fixtures.workspaceDir, 'y/etc/hosts'))
+      ).toBe(true)
+
+      expect(response.downloadPath).toBe(fixtures.workspaceDir)
     })
 
     it('should successfully download an artifact to user defined path', async () => {