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Exploited vulnerability · CISA KEV

Is CVE-2020-28949 exploited? Yes: in CISA KEV since 25 Aug 2022

Gociux · PEAR Archive_Tar · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2020-28949, PEAR Archive_Tar Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 25 Aug 2022, 644 days after it was published. It affects PEAR Archive_Tar. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 25 Aug 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.8CVSS 3.1 · high
US federal due15 Sep 2022BOD 22-01 deadline

What it is

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.

VendorPEAR (2 exploited CVEs in KEV)
ProductArchive_Tar
VulnerabilityPEAR Archive_Tar Deserialization of Untrusted Data Vulnerability
WeaknessCWE-74
Published19 Nov 2020
Added to KEV25 Aug 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Archive_Tar in your asset inventory, including appliances and cloud images. Stack check lists every exploited PEAR CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 19 Nov 2020.
  4. Get told next time. Email alerts when CISA adds a CVE for PEAR.

Other exploited CVEs in Archive_Tar

References

Questions

Is CVE-2020-28949 being exploited?

Yes. CISA added CVE-2020-28949 to the Known Exploited Vulnerabilities catalog on 25 Aug 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2020-28949 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2020-28949?

Apply updates per vendor instructions. Check PEAR's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Archive_Tar and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in August 2022 · PEAR scorecard · act-now radar.

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