CVE-2019-20382 — QEMU 4

QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resulting in a situation where memory allocated in deflateInit2 is not freed in deflateEnd.

01What is this vulnerability?

QEMU 4.1.0 has a memory leak in zrle_compress_data in ui/vnc-enc-zrle.c during a VNC disconnect operation because libz is misused, resulting in a situation where memory allocated in deflateInit2 is not freed in deflateEnd.

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: 2020-03-05T18:27:21.000Z
• Last modified: 2024-08-05T02:39:09.409Z

09References

• git.qemu.org — https://git.qemu.org/?p=qemu.git%3Ba=commit%3Bh=6bf21f3d83e95bcc4ba35a7a07cc6655…
• www.openwall.com — http://www.openwall.com/lists/oss-security/2020/03/05/1
• lists.opensuse.org — http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00007.html
• www.debian.org — https://www.debian.org/security/2020/dsa-4665
• usn.ubuntu.com — https://usn.ubuntu.com/4372-1/
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html