CVE-2020-10378 — In libImaging/PcxDecode

In libImaging/PcxDecode.c in Pillow before 7.1.0, an out-of-bounds read can occur when reading PCX files where state->shuffle is instructed to read beyond state->buffer.

01What is this vulnerability?

In libImaging/PcxDecode.c in Pillow before 7.1.0, an out-of-bounds read can occur when reading PCX files where state->shuffle is instructed to read beyond state->buffer.

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: 2020-06-25T18:22:30.000Z
• Last modified: 2024-08-04T10:58:40.510Z

09References

• github.com — https://github.com/python-pillow/Pillow/commits/master/src/libImaging
• github.com — https://github.com/python-pillow/Pillow/pull/4538
• github.com — https://github.com/python-pillow/Pillow/commit/6a83e4324738bb0452fbe8074a995b1c7…
• pillow.readthedocs.io — https://pillow.readthedocs.io/en/stable/releasenotes/7.1.0.html
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro…
• usn.ubuntu.com — https://usn.ubuntu.com/4430-1/
• usn.ubuntu.com — https://usn.ubuntu.com/4430-2/