CVE-2019-15691

Name	CVE-2019-15691
Description	TigerVNC version prior to 1.10.1 is vulnerable to stack use-after-return, which occurs due to incorrect usage of stack memory in ZRLEDecoder. If decoding routine would throw an exception, ZRLEDecoder may try to access stack variable, which has been already freed during the process of stack unwinding. Exploitation of this vulnerability could potentially result into remote code execution. This attack appear to be exploitable via network connectivity.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	947428

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
tigervnc (PTS)	stretch (security), stretch (lts), stretch	1.7.0+dfsg-7+deb9u2	fixed
	buster	1.9.0+dfsg-3+deb10u3	fixed
	bullseye	1.11.0+dfsg-2+deb11u1	fixed
	bookworm	1.12.0+dfsg-8	fixed
	sid, trixie	1.13.1+dfsg-3	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Debian Bugs
tigervnc	source	stretch	1.7.0+dfsg-7+deb9u1
tigervnc	source	buster	1.9.0+dfsg-3+deb10u1
tigervnc	source	(unstable)	1.10.1+dfsg-1	947428

Notes

https://www.openwall.com/lists/oss-security/2019/12/20/2
https://github.com/TigerVNC/tigervnc/commit/d61a767d6842b530ffb532ddd5a3d233119aad40 (master)
https://github.com/TigerVNC/tigervnc/commit/042de4642293df9b72a08189c249e2da79cbca91 (v1.10.1)