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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel Race Condition in prepare_binprm() Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1032412
SecurityTracker URL:  http://securitytracker.com/id/1032412
CVE Reference:   CVE-2015-3339   (Links to External Site)
Date:  May 28 2015
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.19.6
Description:   A vulnerability was reported in the Linux Kernel. A local user can obtain elevated privileges on the target system.

A local user can execute a set userid (setuid) program when a chown to root has occurred but the setuid bit has not been removed to exploit a race condition in the prepare_binprm() function in 'fs/exec.c' and gain root privileges.

Impact:   A local user can obtain root privileges on the target system.
Solution:   The vendor has issued a fix (3.19.6) [in April 2015].

The vendor's advisory is available at:

https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.19.6

Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jul 31 2015 (Oracle Issues Fix for Oracle Linux) Linux Kernel Race Condition in prepare_binprm() Lets Local Users Gain Elevated Privileges
Oracle has issued a fix for Oracle Linux 6 and 7.
Aug 5 2015 (Oracle Issues Fix for Oracle Linux) Linux Kernel Race Condition in prepare_binprm() Lets Local Users Gain Elevated Privileges
Oracle has issued a fix for Oracle Linux 5 and 6.
Nov 20 2015 (Red Hat Issues Fix) Linux Kernel Race Condition in prepare_binprm() Lets Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.
Nov 20 2015 (Red Hat Issues Fix) Linux Kernel Race Condition in prepare_binprm() Lets Local Users Gain Elevated Privileges
Red Hat has issued a fix for Red Hat Enterprise Linux 7.



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