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TITLE:
GNU Emacs vcdiff Insecure Temporary Files

SECUNIA ADVISORY ID:
SA29905

VERIFY ADVISORY:
http://secunia.com/advisories/29905/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

SOFTWARE:
GNU Emacs 22.x
http://secunia.com/product/16432/
GNU Emacs 21.x
http://secunia.com/product/4617/

DESCRIPTION:
Some security issues have been reported in GNU Emacs, which can be
exploited by malicious, local users to perform certain actions with
escalated privileges.

The security issues are caused due to the vcdiff utility
(lib-src/vcdiff) using temporary files in an insecure manner. This
can be exploited via symlink attacks to e.g. overwrite arbitrary
files with the privileges of the user running the vcdiff utility.

The security issues are reported in versions 21.4a and 22.2. Other
versions may also be affected.

SOLUTION:
Fixed in the CVS repository.

PROVIDED AND/OR DISCOVERED BY:
Steve Grubb, Red Hat

ORIGINAL ADVISORY:
Red Hat Bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=208483

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
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Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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