Arch Linux Security Advisory ASA-201507-4
========================================
Severity: Medium
Date    : 2015-07-04
CVE-ID  : CVE-2015-5352
Package : openssh
Type    : XSECURITY restrictions bypass
Remote  : Yes
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package openssh before version 6.9p1-1 is vulnerable to XSECURITY
restrictions bypass.

Resolution
=========
Upgrade to 6.9p1-1.

# pacman -Syu "openssh>=6.9p1-1"

The problem has been fixed upstream in version 6.9p1.

Workaround
=========
None.

Description
==========
When forwarding X11 connections with ForwardX11Trusted=no, connections
made after ForwardX11Timeout expired could be permitted and no longer
subject to XSECURITY restrictions because of an ineffective timeout
check in ssh coupled with "fail open" behaviour in the X11 server when
clients attempted connections with expired credentials. This problem was
reported by Jann Horn.

Impact
=====
A remote attacker is able to bypass the XSECURITY restrictions when
forwarding X11 connections by making use of an ineffective timeout check.

References
=========
http://www.openssh.com/txt/release-6.9
https://access.redhat.com/security/cve/CVE-2015-5352

ArchLinux: 201507-4: openssh: XSECURITY restrictions bypass

July 4, 2015

Summary

When forwarding X11 connections with ForwardX11Trusted=no, connections made after ForwardX11Timeout expired could be permitted and no longer subject to XSECURITY restrictions because of an ineffective timeout check in ssh coupled with "fail open" behaviour in the X11 server when clients attempted connections with expired credentials. This problem was reported by Jann Horn.

Resolution

Upgrade to 6.9p1-1. # pacman -Syu "openssh>=6.9p1-1"
The problem has been fixed upstream in version 6.9p1.

References

http://www.openssh.com/txt/release-6.9 https://access.redhat.com/security/cve/CVE-2015-5352

Severity
Package : openssh
Type : XSECURITY restrictions bypass
Remote : Yes
Link : https://wiki.archlinux.org/title/CVE

Workaround

None.

Related News

Parrot OS 6.3: Elevating Security with Enhanced Features & Tools
3 - 5 min read
Parrot OS 6.3 has just arrived , bringing crucial updates that security admins should note. This latest version of the popular secure Linux
Linux Kernel 6.14 Released: Top Security Features You Need to Know
3 - 6 min read
With the release of Linux kernel 6.14 , admins and Linux users have many new features and enhancements to look forward to - especially in the realm
Don
2 - 4 min read
Google recently issued a crucial Chrome update that those using a version of the browser prior to version 132.0.6834.110 should implement
Intel Brings Next-Level Security to Linux with Partner Security Engine
3 - 6 min read
Intel recently introduced a game-changer in hardware security with its new Partner Security Engine integrated into the Core Ultra Series 2. This
A Tiny Linux Kernel Tweak with Massive Implications for Datacenter Efficiency
3 - 6 min read
In a groundbreaking development, security researchers have introduced a small but mighty tweak to the Linux kernel that promises to cut data center
Best Practices for Securing Linux Systems Against Malicious Bots
3 - 6 min read
Linux systems have long been an indispensable asset to businesses and individuals alike. From running servers and cloud infrastructure to powering
Securing Open-Source Projects with Automated Testing on Linux
4 - 7 min read
Open-source project security testing focuses on many components, ensuring there are no safety vulnerabilities. These components include physical
KaOS Linux 2025.01: Merging Security with Practicality
3 - 6 min read
As the realm of Linux distribution expands, security admins find themselves faced with choosing a system that fits operational needs and upholds

Get the Latest News & Insights

Sign up to get the latest security news affecting Linux and open source delivered straight to your inbox.

© 2024 Guardian Digital, Inc All Rights Reserved