CVE-2016-9942: Buffer Overflow
First published: Sat Dec 31 2016(Updated: )
Heap-based buffer overflow in ultra.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message with the Ultra type tile, such that the LZO payload decompressed length exceeds what is specified by the tile dimensions.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Libvncserver Project Libvncserver | =0.9.10 | |
| debian/libvncserver | 0.9.13+dfsg-2+deb11u1 0.9.14+dfsg-1 | |
| debian/veyon | 4.5.3+repack1-1 4.7.5+repack1-1 4.7.5+repack1-1.2 |
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Reference Links
- http://www.debian.org/security/2017/dsa-3753
- http://www.securityfocus.com/bid/95170
- https://github.com/LibVNC/libvncserver/pull/137
- https://github.com/LibVNC/libvncserver/releases/tag/LibVNCServer-0.9.11
- https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
- https://security.gentoo.org/glsa/201702-24
- https://usn.ubuntu.com/4587-1/
- https://launchpad.net/bugs/cve/CVE-2016-9942
- https://github.com/LibVNC/libvncserver/pull/137/commits/5fff4353f66427b467eb29e5fdc1da4f2be028bb
- https://security-tracker.debian.org/tracker/CVE-2016-9942
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9942
- https://nvd.nist.gov/vuln/detail/CVE-2016-9942
- https://ubuntu.com/security/CVE-2016-9942
Frequently Asked Questions
What is CVE-2016-9942?
CVE-2016-9942 is a heap-based buffer overflow vulnerability in LibVNCServer that allows remote servers to cause a denial of service or execute arbitrary code.
How does CVE-2016-9942 affect LibVNCClient?
CVE-2016-9942 affects LibVNCClient in LibVNCServer versions before 0.9.11.
What is the severity of CVE-2016-9942?
CVE-2016-9942 has a severity rating of 9.8 (Critical).
How can CVE-2016-9942 be fixed?
To fix CVE-2016-9942, update to LibVNCServer version 0.9.11 or later.
Where can I find more information about CVE-2016-9942?
More information about CVE-2016-9942 can be found at the following references: [link1](https://github.com/LibVNC/libvncserver/pull/137), [link2](https://github.com/LibVNC/libvncserver/pull/137/commits/5fff4353f66427b467eb29e5fdc1da4f2be028bb), [link3](https://security-tracker.debian.org/tracker/CVE-2016-9942).
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- vendor/libvncserver project
- canonical/libvncserver project libvncserver
- version/libvncserver project libvncserver/0.9.10
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