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Category:   Application (Security)  >   libtASN1 Vendors:   gnutls.org
libtASN1 Stack Overflow in asn1_find_node() in Processing Assignment Files Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1038619
SecurityTracker URL:  http://securitytracker.com/id/1038619
CVE Reference:   CVE-2017-6891   (Links to External Site)
Date:  Jun 6 2017
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in libtASN1. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted assignment file that, when loaded by the target user, will trigger a stack overflow in asn1_find_node() in 'lib/parser_aux.c' and execute arbitrary code on the target system. The code will run with the privileges of the target user.

The vendor was notified on May 15, 2017.

The original advisory is available at:

https://secuniaresearch.flexerasoftware.com/secunia_research/2017-11/

Jakub Jirasek, Secunia Research at Flexera Software, reported this vulnerability.

Impact:   A remote user can create content that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a source code fix, available at:

https://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commit;h=5520704d075802df25ce4ffccc010ba1641bd484

Vendor URL:  www.gnu.org/software/libtasn1/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 6 2017 (Ubuntu Issues Fix) libtASN1 Stack Overflow in asn1_find_node() in Processing Assignment Files Lets Remote Users Execute Arbitrary Code
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, 16.10, and 17.04.



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