Bug 1418952 – CVE-2017-5885 gtk-vnc: Integer overflow when processing SetColorMapEntries

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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

Status:	NEW

Aliases:	CVE-2017-5885

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20170201,reported=2...
Keywords:	Security

Depends On:	1418955 1418956 1425367
Blocks:	1415638 1418954
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Reported:	2017-02-03 04:03 EST by Adam Mariš
Modified:	2018-07-18 11:14 EDT (History)
CC List:	18 users (show)

See Also:
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.
Story Points:	---
Clone Of:
Environment:
Last Closed:
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:2258	normal	SHIPPED_LIVE	Moderate: gtk-vnc security, bug fix, and enhancement update	2017-08-01 14:21:01 EDT

Groups: None (edit)

Description Adam Mariš 2017-02-03 04:03:39 EST

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:

https://bugzilla.gnome.org/show_bug.cgi?id=778050

Upstream patch:

https://git.gnome.org/browse/gtk-vnc/commit/?id=c8583fd3783c5b811590

Comment 1 Adam Mariš 2017-02-03 04:13:14 EST

Created gtk-vnc tracking bugs for this issue:

Affects: fedora-all [bug 1418955]

Comment 2 Adam Mariš 2017-02-03 04:13:29 EST

Created mingw-gtk-vnc tracking bugs for this issue:

Affects: fedora-all [bug 1418956]

Comment 3 Adam Mariš 2017-02-06 03:45:22 EST

CVE assignment:

http://openwall.com/lists/oss-security/2017/02/05/5

Comment 4 Daniel Berrange 2017-02-07 09:13:31 EST

Upstream fix in git master is

commit c8583fd3783c5b811590fcb7bae4ce6e7344963e
Author: Daniel P. Berrange <berrange@redhat.com>
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.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778050
    
    CVE-2017-5885
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

Comment 9 errata-xmlrpc 2017-08-01 15:57:10 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2258 https://access.redhat.com/errata/RHSA-2017:2258

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