CVE-2017-18922

high

Published 2020-08-10 · Modified 2020-08-10

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

8.0

Description

It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2017-18922 NameCVE-2017-18922 DescriptionIt was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow. SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE…

CVE-2017-18922

Name	CVE-2017-18922
Description	It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libvncserver (PTS)	bullseye	0.9.13+dfsg-2+deb11u1	fixed
	bookworm	0.9.14+dfsg-1+deb12u1	fixed
	trixie	0.9.15+dfsg-1+deb13u1	fixed
	forky, sid	0.9.15+dfsg-5	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libvncserver	source	(unstable)	0.9.12+dfsg-3

Notes

[buster] - libvncserver <ignored> (Required change too invasive, minor issue)
[stretch] - libvncserver <ignored> (Required change too invasive, minor issue)
https://github.com/LibVNC/libvncserver/commit/aac95a9dcf4bbba87b76c72706c3221a842ca433
https://www.openwall.com/lists/oss-security/2020/06/30/2

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[buster] - libvncserver <ignored> (Required change too invasive, minor issue)[stretch] - libvncserver <ignored> (Required change too invasive, minor issue)https://github.com/LibVNC/libvncserver/commit/aac95a9dcf4bbba87b76c72706c3221a842ca433https://www.openwall.com/lists/oss-security/2020/06/30/2

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`0.9.12+dfsg-3`
sid	Fixed	`0.9.12+dfsg-3`
forky	Fixed	`0.9.12+dfsg-3`
bullseye	Fixed	`0.9.12+dfsg-3`
bookworm	Fixed	`0.9.12+dfsg-3`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.