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CVE-2020-28949: PEAR Archive_Tar Deserialization of Untrusted Data Vulnerability

criticalknown exploitedpublic exploitCVE-2020-28949
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 allows an unserialization attack because phar: is blocked but PHAR: is not blocked. 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_TarUnsafe deserialization
What
An unserialization attack is possible due to improper blocking of phar: and PHAR: protocols.
Who is affected
Users of PEAR Archive_Tar in third-party products like Drupal Core and Red Hat Linux.
Urgency
Remediation is urgent as the vulnerability is actively exploited and critical in nature.
Action
Update PEAR Archive_Tar to the latest version to address the deserialization issue.

AI-assisted analysis generated from the source advisory — verify against the original.

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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-2020-28949

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-2020-28949coverage & exploitation statusNVD · CVE.org

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