Homeland Security Uncovers Critical Flaw in X11

Use Netsparker


An open-source security audit program funded by the U.S. Department of Homeland Security has flagged a critical vulnerability in the X Window System (X11) which is used in Unix and Linux systems. A missing parentheses in a bit of code is to blame. The error can grant a user root access, and was discovered using an automated code-scanning tool.

The flaw has been fixed.

It was a change from this:

if (getuid() == 0 || geteuid != 0)

to this:

if (getuid() == 0 || geteuid() != 0)

The best part was the CVS comment:

Fri Mar 10 17:29:51 2006 UTC (7 weeks, 4 days ago) by deraadt:
proper geteuid calls because suse hires people who mistype things

From the article:

Coverity, the San Franciso-based company managing the project under a $1.25 million grant, described the flaw as the “biggest security vulnerability” found in the X Window System code since 2000.

The X Window System, also called X11 or X, provides the toolkit and protocol to build GUIs for Unix and Unix-like operating systems. It is used to provide windowing for bit-map displays.

Source: Yahoo News

Apparently OpenBSD already fixed this during a code-cleanup.

Posted in: Exploits/Vulnerabilities, Linux Hacking

, , , , , , ,


Latest Posts:


CloudFrunt - Identify Misconfigured CloudFront Domains CloudFrunt – Identify Misconfigured CloudFront Domains
CloudFrunt is a Python-based tool for identifying misconfigured CloudFront domains, it uses DNS and looks for CNAMEs which may be allowed to be associated with CloudFront distributions.
Airbash - Fully Automated WPA PSK Handshake Capture Script Airbash – Fully Automated WPA PSK Handshake Capture Script
Airbash is a POSIX-compliant, fully automated WPA PSK handshake capture script aimed at penetration testing, it is compatible with Bash and Android Shell.
XXEinjector - Automatic XXE Injection Tool For Exploitation XXEinjector – Automatic XXE Injection Tool For Exploitation
XXEinjector is an XXE Injection Tool that automates retrieving files using direct and out of band methods. Directory listing only works in Java applications.
Yahoo! Fined 35 Million USD For Late Disclosure Of Hack Yahoo! Fined 35 Million USD For Late Disclosure Of Hack
Ah Yahoo! in trouble again, this time the news is Yahoo! fined for 35 million USD by the SEC for the 2 year delayed disclosure of the massive hack, we actually reported on the incident in 2016 when it became public.
Drupwn - Drupal Enumeration Tool & Security Scanner Drupwn – Drupal Enumeration Tool & Security Scanner
Drupwn is a Python-based Drupal Enumeration Tool that also includes an exploit mode, which can check for and exploit relevant CVEs.
MyEtherWallet DNS Hack Causes 17 Million USD User Loss MyEtherWallet DNS Hack Causes 17 Million USD User Loss
Big news in the crypto scene this week was that the MyEtherWallet DNS Hack that occured managed to collect about $17 Million USD worth of Ethereum in just a few hours.


Comments are closed.