Bug 1050928 (CVE-2014-0011) - CVE-2014-0011 tigervnc: ZRLE decoding heap-based buffer overflow in vncviewer
Summary: CVE-2014-0011 tigervnc: ZRLE decoding heap-based buffer overflow in vncviewer
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2014-0011
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1048994 1074555 1078508
Blocks: 1050929
TreeView+ depends on / blocked
 
Reported: 2014-01-09 11:24 UTC by Ratul Gupta
Modified: 2019-09-29 13:12 UTC (History)
6 users (show)

Fixed In Version: tigervnc 1.3.1
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-03-19 20:04:58 UTC


Attachments (Terms of Use)
tigervnc-CVE-2014-0011.patch (Fedora/master) (1.72 KB, patch)
2014-02-04 17:28 UTC, Tim Waugh
no flags Details | Diff

Description Ratul Gupta 2014-01-09 11:24:08 UTC
A heap-based buffer overflow was found in the way vncviewer rendered certain screen images from a vnc server. If a user could be tricked into connecting to a malicious vnc server, it may cause the vncviewer to crash, or could possibly execute arbitrary code with the permissions of the user running it.

Comment 14 Tomas Hoger 2014-03-11 15:56:58 UTC
This issue was tracked to an issue in the ZRLE_DECODE() function which perform RLE decoding.  The function already contained boundary checks inside assert().  Those checks were, however, disabled in builds with NDEBUG, such as tigervnc packages in Fedora.

The tigervnc packages in Red Hat Enterprise Linux 6, and the vnc packages in Red Hat Enterprise Linux 5, were not built with NDEBUG and have those checks enabled.  Therefore, they are not affected by this issue.

Tim Waugh prepared a patch that:
- replaces relevant asserts with explicit checks that raise exception
- changing build configuration to not use NDEBUG

Patch is attached as attachment 859269 [details]

Comment 15 Tomas Hoger 2014-03-19 17:16:16 UTC
The issue is now fixed upstream in TigerVNC 1.3.1:
http://sourceforge.net/p/tigervnc/mailman/message/32120476/

Upstream commits (applying patch mentioned in commnet 14):
http://sourceforge.net/p/tigervnc/code/5163
http://sourceforge.net/p/tigervnc/code/5164

Comment 17 Tomas Hoger 2014-03-19 19:34:41 UTC
Statement:

Not vulnerable. This issue did not affect the tigervnc packages as shipped with Red Hat Enterprise Linux 6, and the vnc packages as shipped with Red Hat Enterprise Linux 5.

Comment 18 Fedora Update System 2014-03-24 06:41:32 UTC
tigervnc-1.3.0-14.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 19 Fedora Update System 2014-04-05 04:56:37 UTC
tigervnc-1.3.0-10.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.


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