CVE-2019-15691

NameCVE-2019-15691
DescriptionTigerVNC 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs947428

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tigervnc (PTS)stretch1.7.0+dfsg-7vulnerable
buster1.9.0+dfsg-3vulnerable
bullseye, sid1.10.1+dfsg-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
tigervncsource(unstable)1.10.1+dfsg-1947428

Notes

[buster] - tigervnc <no-dsa> (Minor issue; can be fixed via point release)
[stretch] - tigervnc <no-dsa> (Minor issue; can be fixed via point release)
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)

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