Bug 985540 (CVE-2013-4143) - CVE-2013-4143 xlockmore: NULL pointer dereference leads to crash and bypass of screen lock
Summary: CVE-2013-4143 xlockmore: NULL pointer dereference leads to crash and bypass o...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2013-4143
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: 985542
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-07-17 17:34 UTC by Vincent Danen
Modified: 2019-09-29 13:06 UTC (History)
2 users (show)

Fixed In Version: xlockmore 5.43
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-08-02 19:57:14 UTC


Attachments (Terms of Use)

Description Vincent Danen 2013-07-17 17:34:55 UTC
It was reported [1],[2] that xlockmore 5.43 fixes a NULL pointer dereference in situations where the crypt() call fails (the release notes indicate this is possible with glibc starting with version 2.17 due to crypt() failures returning EINVAL with a NULL return in certain situations).  This could cause xlock to crash, which would allow for local users to obtain access to a locked desktop they would normally require a password to access.

A patch [3] is available.

This affects Fedora 19 as it provides glibc 2.17.  Earlier versions are not affected.


[1] http://www.tux.org/~bagleyd/xlock/xlockmore.README
[2] http://www.openwall.com/lists/oss-security/2013/07/16/8
[3] http://sourceforge.net/projects/miscellaneouspa/files/glibc217/xlockmore-5.42-glibc217-crypt.diff

Comment 1 Vincent Danen 2013-07-17 17:36:51 UTC
Created xlockmore tracking bugs for this issue:

Affects: fedora-19 [bug 985542]

Comment 2 Jan Lieskovsky 2013-07-18 13:39:06 UTC
The CVE identifier of CVE-2013-4143 has been assigned to this issue:
  http://www.openwall.com/lists/oss-security/2013/07/18/6

Comment 3 Fedora Update System 2013-07-30 17:49:45 UTC
xlockmore-5.43-1.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2013-08-05 23:29:59 UTC
xlockmore-5.43-1.el6 has been pushed to the Fedora EPEL 6 stable repository.  If problems still persist, please make note of it in this bug report.


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