CVE-2020-28949
PEAR Archive_Tar Deserialization of Untrusted Data Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 15 September 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 84.55% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 25 August 2022 · due 15 September 2022
- Affected
- php/archive tar · debian/debian linux · fedoraproject/fedora · drupal/drupal
- Source
- cve@mitre.org
EPSS 84.6% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://pear.php.net/bugs/bug.php?id=27002, https://www.drupal.org/sa-core-2020-013, https://access.redhat.com/security/cve/cve-2020-28949; https://nvd.nist.gov/vuln/detail/CVE-2020-28949
References
- http://packetstormsecurity.com/files/161095/PEAR-Archive_Tar-Arbitrary-File-Write.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/pear/Archive_Tar/issues/33Exploit, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00045.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42GPGVVFTLJYAKRI75IVB5R45NYQGEUR/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4V35LBRM6HBCXBVCITKQ4UEBTXO2EG7B/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NBYZSHYTIOBK6V7C4N7TP6KIKCRKLVWP/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJQQYDAOWHD6RDITDRPHFW7WY6BS3V5N/Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202101-23Third Party Advisory
- https://www.debian.org/security/2020/dsa-4817Mailing List, Third Party Advisory
- https://www.drupal.org/sa-core-2020-013Third Party Advisory
- http://packetstormsecurity.com/files/161095/PEAR-Archive_Tar-Arbitrary-File-Write.htmlExploit, Third Party Advisory, VDB Entry
- https://github.com/pear/Archive_Tar/issues/33Exploit, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00045.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42GPGVVFTLJYAKRI75IVB5R45NYQGEUR/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4V35LBRM6HBCXBVCITKQ4UEBTXO2EG7B/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NBYZSHYTIOBK6V7C4N7TP6KIKCRKLVWP/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJQQYDAOWHD6RDITDRPHFW7WY6BS3V5N/Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202101-23Third Party Advisory
- https://www.debian.org/security/2020/dsa-4817Mailing List, Third Party Advisory
- https://www.drupal.org/sa-core-2020-013Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-28949US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.