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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
Glibc process_envvars() Flaw Lets Local Users Bypass Pointer Guard Protection
SecurityTracker Alert ID:  1034811
SecurityTracker URL:  http://securitytracker.com/id/1034811
CVE Reference:   CVE-2015-8777   (Links to External Site)
Date:  Jan 26 2016
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.22.90
Description:   A vulnerability was reported in Glibc. A local user can bypass security restrictions.

A local user can supply a specially crafted LD_POINTER_GUARD environment variable value to bypass pointer guard protection on set user ID (setuid) and set group ID (setgid) programs.

The vulnerability resides in the process_envvars() function in elf/rtld.c'.

Hector Marco-Gisbert reported this vulnerability.

Impact:   A local user can bypass pointer guard protection on setuid and setgid programs.
Solution:   The vendor has issued a fix (2.23) [in October 2015].

The vendor's advisory is available at:

https://sourceware.org/bugzilla/show_bug.cgi?id=18928

Vendor URL:  www.gnu.org/software/libc/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 26 2016 (Ubuntu Issues Fix) Glibc process_envvars() Flaw Lets Local Users Bypass Pointer Guard Protection
Ubuntu has issued a fix for Ubuntu Linux 12.04 LTS, 14.04 LTS, and 15.10.
Jul 8 2016 (IBM Issues Fix for IBM BladeCenter Advanced Management Module) Glibc process_envvars() Flaw Lets Local Users Bypass Pointer Guard Protection
IBM has issued a fix for IBM BladeCenter Advanced Management Module.
Aug 1 2017 (Red Hat Issues Fix) Glibc process_envvars() Flaw Lets Local Users Bypass Pointer Guard Protection
Red Hat has issued a fix for Red Hat Enterprise Linux 7.



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