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Bug 1418952 (CVE-2017-5885) - CVE-2017-5885 gtk-vnc: Integer overflow when processing SetColorMapEntries
Summary: CVE-2017-5885 gtk-vnc: Integer overflow when processing SetColorMapEntries
Alias: CVE-2017-5885
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1418955 1418956 1425367
TreeView+ depends on / blocked
Reported: 2017-02-03 09:03 UTC by Adam Mariš
Modified: 2019-09-29 14:06 UTC (History)
16 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
An integer overflow flaw was found in gtk-vnc. A remote malicious VNC server could use this flaw to crash VNC viewers which are based on the gtk-vnc library.
Clone Of:
Last Closed: 2019-06-08 03:07:01 UTC

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2258 0 normal SHIPPED_LIVE Moderate: gtk-vnc security, bug fix, and enhancement update 2017-08-01 18:21:01 UTC

Description Adam Mariš 2017-02-03 09:03:39 UTC
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:

Upstream patch:

Comment 1 Adam Mariš 2017-02-03 09:13:14 UTC
Created gtk-vnc tracking bugs for this issue:

Affects: fedora-all [bug 1418955]

Comment 2 Adam Mariš 2017-02-03 09:13:29 UTC
Created mingw-gtk-vnc tracking bugs for this issue:

Affects: fedora-all [bug 1418956]

Comment 3 Adam Mariš 2017-02-06 08:45:22 UTC
CVE assignment:

Comment 4 Daniel Berrangé 2017-02-07 14:13:31 UTC
Upstream fix in git master is

commit c8583fd3783c5b811590fcb7bae4ce6e7344963e
Author: Daniel P. Berrange <berrange>
Date:   Thu Feb 2 18:18:48 2017 +0000

    Correctly validate color map range indexes
    The color map index could wrap around to zero causing negative
    array index accesses.
    Signed-off-by: Daniel P. Berrange <berrange>

Comment 9 errata-xmlrpc 2017-08-01 19:57:10 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2258

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