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CVE-2020-36193: PEAR Archive_Tar Improper Link Resolution Vulnerability

criticalknown exploitedCVE-2020-36193
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
PEAR Archive_Tar Tar.php allows write operations with directory traversal due to inadequate checking of symbolic links. PEAR stands for PHP Extension and Application Repository and it is an open-source framework and distribution system for reusable PHP components with known usage in third-party products such as Drupal Core and Red Hat Linux.

CSIRTS triage

vendor: PEARproduct: Archive_TarRemote code executionPath traversal
What
The vulnerability allows for directory traversal during write operations due to inadequate symbolic link checks.
Who is affected
Users of PEAR Archive_Tar, particularly in third-party products like Drupal Core and Red Hat Linux, are affected.
Urgency
Immediate remediation is necessary as exploitation is possible and the severity is critical.
Action
Update to the latest version of PEAR Archive_Tar.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-08-25
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2020-36193

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2020-36193coverage & exploitation statusNVD · CVE.org

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