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Category:   Application (E-mail Server)  >   Exim Vendors:   Exim.org
(Ubuntu Issues Fix) Exim Memory Leak Lets Local Users Gain Elevated Privileges in Certain Cases
SecurityTracker Alert ID:  1038780
SecurityTracker URL:  http://securitytracker.com/id/1038780
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:   Ubuntu has issued a fix.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3322-1

Vendor URL:  www.ubuntu.com/usn/usn-3322-1 (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  14.04 LTS, 16.04 LTS, 16.10, 17.04

Message History:   This archive entry is a follow-up to the message listed below.
Jun 23 2017 Exim Memory Leak Lets Local Users Gain Elevated Privileges in Certain Cases



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