CVE-2019-19221 — In Libarchive 3

In Libarchive 3.4.0, archive_wstring_append_from_mbs in archive_string.c has an out-of-bounds read because of an incorrect mbrtowc or mbtowc call. For example, bsdtar crashes via a crafted archive.

01What is this vulnerability?

In Libarchive 3.4.0, archive_wstring_append_from_mbs in archive_string.c has an out-of-bounds read because of an incorrect mbrtowc or mbtowc call. For example, bsdtar crashes via a crafted archive.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-11-21T00:00:00.000Z
• Last modified: 2024-08-05T02:09:39.580Z

09References

• github.com — https://github.com/libarchive/libarchive/issues/1276
• github.com — https://github.com/libarchive/libarchive/commit/22b1db9d46654afc6f0c28f90af8cdc8…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• usn.ubuntu.com — https://usn.ubuntu.com/4293-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/04/msg00020.html
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html