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Category:   Application (Generic)  >   Glibc Vendors:   GNU [multiple authors]
Glibc Buffer Underflow in __realpath() Lets Local Users Execute Arbitrary Code
SecurityTracker Alert ID:  1040162
SecurityTracker URL:  http://securitytracker.com/id/1040162
CVE Reference:   CVE-2018-1000001   (Links to External Site)
Updated:  Jan 12 2018
Original Entry Date:  Jan 11 2018
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

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

A local user can trigger a buffer underflow in the __realpath() function in 'stdlib/canonicalize.c' to execute arbitrary code on the target system. This can be exploited against set user id (setuid) root applications to gain root privileges on the target system.

The vulnerability occurs due to a change in the processing of pathnames in the getcwd() command introduced in Linux kernel version 2.6.36.

The original advisory is available at:

https://www.halfdog.net/Security/2017/LibcRealpathBufferUnderflow/

halfdog 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://sourceware.org/git/gitweb.cgi?p=glibc.git;h=52a713fdd0a30e1bd79818e2e3c4ab44ddca1a94

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

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jan 18 2018 (Ubuntu Issues Fix) Glibc Buffer Underflow in __realpath() Lets Local Users Execute Arbitrary Code
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 17.10.
Jan 18 2018 (Ubuntu Issues Fix) Glibc Buffer Underflow in __realpath() Lets Local Users Execute Arbitrary Code
Ubuntu has issued a fix for Ubuntu Linux 12.04 ESM.



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