VulnerabilityModified

CVE-2021-23518

CRITICAL 9.8EPSS 1.94%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

The package cached-path-relative before 1.1.0 are vulnerable to Prototype Pollution via the cache variable that is set as {} instead of Object.create(null) in the cachedPathRelative function, which allows access to the parent prototype properties when the object is used to create the cached relative path. When using the origin path as __proto__, the attribute of the object is accessed instead of a path. **Note:** This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-72573

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 1.94% probability · 79th percentile
CISA KEV: Not listed
Weakness: CWE-1321
Affected: cached-path-relative project/cached-path-relative · debian/debian linux
Source: report@snyk.io

References

https://github.com/ashaffer/cached-path-relative/commit/40c73bf70c58add5aec7d11e4f36b93d144bb760Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00006.htmlMailing List, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2348246Exploit, Issue Tracking, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-2342653Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/ashaffer/cached-path-relative/commit/40c73bf70c58add5aec7d11e4f36b93d144bb760Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00006.htmlMailing List, Third Party Advisory
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-2348246Exploit, Issue Tracking, Patch, Third Party Advisory
https://snyk.io/vuln/SNYK-JS-CACHEDPATHRELATIVE-2342653Exploit, Issue Tracking, Patch, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.