CVE-2017-5885: Integer Overflow
First published: Fri Feb 03 2017(Updated: )
It was found that vnc_connection_server_message() and vnc_color_map_set() functions do not check for integer overflow properly, leading to a malicious server being able to overwrite parts of the client memory, possibly leading to remote code execution under privileges of user running the VNC client. Upstream bug: <a href="https://bugzilla.gnome.org/show_bug.cgi?id=778050">https://bugzilla.gnome.org/show_bug.cgi?id=778050</a> Upstream patch: <a href="https://git.gnome.org/browse/gtk-vnc/commit/?id=c8583fd3783c5b811590">https://git.gnome.org/browse/gtk-vnc/commit/?id=c8583fd3783c5b811590</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Fedora | =25 | |
| GTK-VNC | <=0.6.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2017/02/03/5
- http://www.openwall.com/lists/oss-security/2017/02/05/5
- http://www.securityfocus.com/bid/96016
- https://access.redhat.com/errata/RHSA-2017:2258
- https://bugzilla.gnome.org/show_bug.cgi?id=778050
- https://git.gnome.org/browse/gtk-vnc/commit/?id=c8583fd3783c5b811590fcb7bae4ce6e7344963e
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LGPQ5MQR6SN4DYTEFACHP2PP5RR26KYK/
- https://git.gnome.org/browse/gtk-vnc/commit/?id=c8583fd3783c5b811590
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1418955
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1418956
- http://openwall.com/lists/oss-security/2017/02/05/5
- https://access.redhat.com/security/cve/CVE-2017-5885
- https://bugzilla.redhat.com/show_bug.cgi?id=1418952
Frequently Asked Questions
What is the severity of CVE-2017-5885?
CVE-2017-5885 is considered critical due to its potential to allow remote code execution.
How do I fix CVE-2017-5885?
To fix CVE-2017-5885, you should update affected software such as GTK-VNC to version 0.6.1 or later.
What software is affected by CVE-2017-5885?
CVE-2017-5885 affects Fedora 25 and GTK-VNC versions up to and including 0.6.0.
What is the impact of CVE-2017-5885?
The impact of CVE-2017-5885 includes the potential for a malicious server to exploit integer overflow and gain control of the client's memory.
Can CVE-2017-5885 be exploited remotely?
Yes, CVE-2017-5885 can be exploited remotely by an attacker controlling a malicious VNC server.
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