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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
Exim Memory Leak Lets Local Users Gain Elevated Privileges in Certain Cases
SecurityTracker Alert ID:  1038779
SecurityTracker URL:  http://securitytracker.com/id/1038779
CVE Reference:   CVE-2017-1000369   (Links to External Site)
Date:  Jun 23 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Exim. A local user can obtain elevated privileges on the target system in certain cases.

A local user can invoke Exim with multiple '-p' command line arguments to trigger a memory leak. This memory leak can be used to exploit a vulnerability in the underlying operating system and "jump" the kernel's limited stack guard page memory to gain elevated privileges on the target system.

The original advisory is available at:

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

Qualys Research Labs reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   The vendor has issued a source code fix, available at:

https://github.com/Exim/exim/commit/65e061b76867a9ea7aeeb535341b790b90ae6c21

Vendor URL:  exim.org/ (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 23 2017 (Ubuntu Issues Fix) Exim Memory Leak Lets Local Users Gain Elevated Privileges in Certain Cases
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, 16.10, and 17.04.



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