Arch Linux Security Advisory ASA-202103-6

Severity: Medium
Date : 2021-03-13
CVE-ID : CVE-2021-28041
Package : openssh
Type : arbitrary code execution
Remote : Yes
Link : https://security.archlinux.org/AVG-1657

Summary

The package openssh before version 8.5p1-1 is vulnerable to arbitrary
code execution.

Resolution

Upgrade to 8.5p1-1.

pacman -Syu “openssh>=8.5p1-1”

The problem has been fixed upstream in version 8.5p1.

Workaround

None.

Description

ssh-agent in OpenSSH before 8.5 has a double free that may be relevant
in a few less-common scenarios, such as unconstrained agent-socket
access on a legacy operating system, or the forwarding of an agent to
an attacker-controlled host.

Impact

A remote attacker with enough privileges to access the socket of the
forwarding agent might be able to execute arbitrary code.

References

https://www.openssh.com/security.html
https://www.openssh.com/txt/release-8.5
https://github.com/openssh/openssh-portable/commit/e04fd6dde16de1cdc5a4d9946397ff60d96568db
https://security.archlinux.org/CVE-2021-28041