Bug 1167866 (CVE-2014-9157)

Summary: CVE-2014-9157 graphviz: format string vulnerability in yyerror()
Product: [Other] Security Response Reporter: Vasyl Kaigorodov <vkaigoro>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: alex, carnil, jskarvad, tremble, vkaigoro
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-05-20 11:20:42 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1167868, 1167869    
Bug Blocks: 1167867    

Description Vasyl Kaigorodov 2014-11-25 14:30:54 UTC
Format string vulnerability was reported in graphviz [1].
Upstream patch is at [2].

[1]: http://seclists.org/oss-sec/2014/q4/784
[2]: https://github.com/ellson/graphviz/commit/99eda421f7ddc27b14e4ac1d2126e5fe41719081

Comment 1 Vasyl Kaigorodov 2014-11-25 14:33:03 UTC
Created graphviz tracking bugs for this issue:

Affects: fedora-all [bug 1167868]
Affects: epel-5 [bug 1167869]

Comment 2 Jaroslav Škarvada 2014-11-25 17:27:41 UTC
(In reply to Vasyl Kaigorodov from comment #1)
> Affects: epel-5 [bug 1167869]

There is:

agerror(AGERROR_SYNTAX, agxbuse(&xb));

By looking into agerror implementation:

AGERROR_SYNTAX == 1 # agraph.h

Message[1] == "%s" # agerror.c

void agerror(int code, char *str)
  fprintf(stderr, Message[code], str);

Could you recheck the epel-5 vulnerability please?

Comment 3 Murray McAllister 2014-12-02 04:55:37 UTC
This was assigned CVE-2014-9157:


Comment 4 Fedora Update System 2014-12-06 02:28:52 UTC
graphviz-2.34.0-10.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2014-12-06 10:32:51 UTC
graphviz-2.38.0-11.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-12-07 04:40:53 UTC
graphviz-2.30.1-13.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 Tomas Hoger 2015-05-19 21:26:33 UTC
In Red Hat Enterprise Linux, this issue is mitigated by the FORTIFY_SOURCE hardening feature.  It prevents this issue from being exploitable for code execution.  Malicious format string can cause an unexpected termination of affected application (such us some of the graphviz command line tools, or other applications using graphviz's libcgraph library).  It may also lead to disclosure of portions of process memory, if attack providing inputs can also see produced error messages.

Comment 13 Tomas Hoger 2015-05-20 11:11:01 UTC
Upstream pull request with additional agerr() format string fixes:


Comment 14 Tomas Hoger 2015-05-20 11:20:42 UTC
As this is mitigated by the FORTIFY_SOURCE, lowering impact rating accordingly.  We are no longer planning to correct this in future updates of affected already released products.


This issue affects the versions of the graphviz package as shipped with Red Hat Enterprise Linux 6 and 7. Red Hat Product Security has rated this issue as having Low security impact and therefore it is not planned to be addressed in future updates.