CVE-2017-5581: Buffer Overflow
First published: Mon Jan 23 2017(Updated: )
A buffer overflow vulnerability in ModifiablePixelBuffer::fillRect in vncviewer was found allowing malicious VNC server to send crafted RRE message and possibly take control of the TigerVNC viewer. Upstream patch: <a href="https://github.com/TigerVNC/tigervnc/commit/18c020124ff1b2441f714da2017f63dba50720ba">https://github.com/TigerVNC/tigervnc/commit/18c020124ff1b2441f714da2017f63dba50720ba</a> PR: <a href="https://github.com/TigerVNC/tigervnc/pull/399">https://github.com/TigerVNC/tigervnc/pull/399</a> Reference: <a href="http://seclists.org/oss-sec/2017/q1/166">http://seclists.org/oss-sec/2017/q1/166</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/tigervnc | <1.7.1 | 1.7.1 |
| TigerVNC | <=1.7 |
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Reference Links
- http://rhn.redhat.com/errata/RHSA-2017-0630.html
- http://www.openwall.com/lists/oss-security/2017/01/22/1
- http://www.openwall.com/lists/oss-security/2017/01/25/6
- http://www.securityfocus.com/bid/95789
- https://access.redhat.com/errata/RHSA-2017:2000
- https://github.com/TigerVNC/tigervnc/commit/18c020124ff1b2441f714da2017f63dba50720ba
- https://github.com/TigerVNC/tigervnc/pull/399
- https://github.com/TigerVNC/tigervnc/releases/tag/v1.7.1
- https://security.gentoo.org/glsa/201702-19
- http://seclists.org/oss-sec/2017/q1/166
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1415719
- http://seclists.org/oss-sec/2017/q1/189
- https://rhn.redhat.com/errata/RHSA-2017-0630.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1415712
Frequently Asked Questions
What is the severity of CVE-2017-5581?
CVE-2017-5581 is classified as a high-severity vulnerability due to the potential for remote code execution.
How do I fix CVE-2017-5581?
To fix CVE-2017-5581, update the TigerVNC package to version 1.7.1 or later.
Which versions of TigerVNC are affected by CVE-2017-5581?
CVE-2017-5581 affects TigerVNC versions prior to 1.7.1.
Can CVE-2017-5581 be exploited remotely?
Yes, CVE-2017-5581 can be exploited by a malicious VNC server sending crafted RRE messages to the viewer.
What is the impact of CVE-2017-5581?
The impact of CVE-2017-5581 includes potential complete compromise of the TigerVNC viewer, allowing an attacker to take control.
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