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CVE-2020-28949highunder attack

CVE-2020-28949

100Vexday Risk Score

Patch now. It under exploitation confirmed by CISA and has a working public exploit.

ssvc Actcvss 7.8epss 85%
from disclosure to weapon683 days
Published on NVDNov 19
1st PoC+683d
metasploitNov 17
CISA KEV+644d
exploitation probability
85%top 1% of all CVEs
observed exploitation
yesCISA + VulnCheck
2 public exploit(s)
Action required by CISAfederal deadline: 2022-09-15

Apply updates per vendor instructions.

Versions

Affected
composer/pear/archive_tar < 1.4.11
Fixed in
composer/pear/archive_tar 1.4.11
Researched and written with AI from the vendor advisory and public analysis, with the sources above. Always confirm the fixed version in the official advisory before acting.
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/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected products
n/a · n/a
public PoCs found — 2
cve_referencepacketstormsecurity.com/files/161095/PEAR-Archive_Tar-Arbitrary-File-Write.htmlunverifiedvulncheckvulncheck.com/xdb/b36055977e47unverified
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
http://packetstormsecurity.com/files/161095/PEAR-Archive_Tar-Arbitrary-File-Write.htmlhttps://github.com/pear/Archive_Tar/issues/33https://lists.debian.org/debian-lts-announce/2020/11/msg00045.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/42GPGVVFTLJYAKRI75IVB5R45NYQGEUR/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4V35LBRM6HBCXBVCITKQ4UEBTXO2EG7B/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5KSFM672XW3X6BR7TVKRD63SLZGKK437/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KWM4CTMEGAC4I2CHYNJVSROY4CVXVEUT/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NBYZSHYTIOBK6V7C4N7TP6KIKCRKLVWP/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJQQYDAOWHD6RDITDRPHFW7WY6BS3V5N/https://security.gentoo.org/glsa/202101-23https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-28949https://www.debian.org/security/2020/dsa-4817