784141 – (CVE-2012-0804) CVE-2012-0804 cvs: client proxy_connect heap-based buffer overflow

Bug 784141 (CVE-2012-0804) - CVE-2012-0804 cvs: client proxy_connect heap-based buffer overflow

Summary: CVE-2012-0804 cvs: client proxy_connect heap-based buffer overflow

Keywords:
Status:	CLOSED ERRATA
Alias:	CVE-2012-0804
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Red Hat Product Security
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	784338 784339 784341 784342 787683
Blocks:	784142
TreeView+	depends on / blocked

Reported:	2012-01-23 22:59 UTC by Vincent Danen
Modified:	2019-09-29 12:50 UTC (History)
CC List:	4 users (show)
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2012-02-21 22:42:37 UTC
Embargoed:

Attachments	(Terms of Use)
proposed patch to correct the flaw in 1.11 branch with back-ported proxy support (698 bytes, patch) 2012-01-23 23:03 UTC, Vincent Danen	no flags	Details \| Diff
Proposed fix for cvs development branch 1.12 (1.03 KB, patch) 2012-02-07 15:31 UTC, Petr Pisar	no flags	Details \| Diff
View All

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2012:0321	0	normal	SHIPPED_LIVE	Moderate: cvs security update	2012-02-22 02:17:01 UTC

Description Vincent Danen 2012-01-23 22:59:52 UTC

When correcting a crash in CVS [1] it was found that the CVS client suffers from a flaw that causes a heap overflow.  If certain conditions are met, glib SIGABRTs the process because glibc memory management structures become corrupted.  The flaw is in the proxy_connect() function (src/client.c), where sscanf() copies the first word from read_buf to write_buf without checking if there is enough space in write_buf.

This could allow a malicious HTTP proxy server to cause a denial of service to CVS clients or, possibly, execute arbitrary code on the client system with the privileges of the user running cvs, by sending a malicious HTTP response code to the connecting client.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=773699

Comment 2 Vincent Danen 2012-01-23 23:03:26 UTC

Created attachment 557095 [details]
proposed patch to correct the flaw in 1.11 branch with back-ported proxy support

Comment 12 Tomas Hoger 2012-02-06 13:54:01 UTC

Lifting embargo.

Comment 13 Tomas Hoger 2012-02-06 14:07:00 UTC

Created cvs tracking bugs for this issue

Affects: fedora-all [bug 787683]

Comment 14 Petr Pisar 2012-02-07 15:31:50 UTC

Created attachment 559993 [details]
Proposed fix for cvs development branch 1.12

Comment 15 Fedora Update System 2012-02-15 11:29:50 UTC

cvs-1.11.23-17.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 16 Fedora Update System 2012-02-15 11:36:46 UTC

cvs-1.11.23-22.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 17 errata-xmlrpc 2012-02-21 21:17:48 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 5

Via RHSA-2012:0321 https://rhn.redhat.com/errata/RHSA-2012-0321.html

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