Headline
Ubuntu Security Notice USN-6242-2
Ubuntu Security Notice 6242-2 - USN-6242-1 fixed a vulnerability in OpenSSH. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. It was discovered that OpenSSH incorrectly handled loading certain PKCS#11 providers. If a user forwarded their ssh-agent to an untrusted system, a remote attacker could possibly use this issue to load arbitrary libraries from the user’s system and execute arbitrary code.
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Ubuntu Security Notice USN-6242-2
July 31, 2023
openssh vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
Summary:
OpenSSH could be made to run programs as your login when using ssh-agent
forwarding.
Software Description:
- openssh: secure shell (SSH) for secure access to remote machines
Details:
USN-6242-1 fixed a vulnerability in OpenSSH. This update provides
the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS,
and Ubuntu 18.04 LTS.
Original advisory details:
It was discovered that OpenSSH incorrectly handled loading certain PKCS#11
providers. If a user forwarded their ssh-agent to an untrusted system, a
remote attacker could possibly use this issue to load arbitrary libraries
from the user’s system and execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
openssh-client 1:7.6p1-4ubuntu0.7+esm1
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
openssh-client 1:7.2p2-4ubuntu2.10+esm3
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
openssh-client 1:6.6p1-2ubuntu2.13+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-6242-2
https://ubuntu.com/security/notices/USN-6242-1
CVE-2023-38408
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Ubuntu Security Notice 6242-1 - It was discovered that OpenSSH incorrectly handled loading certain PKCS#11 providers. If a user forwarded their ssh-agent to an untrusted system, a remote attacker could possibly use this issue to load arbitrary libraries from the user's system and execute arbitrary code.
Details have emerged about a now-patched flaw in OpenSSH that could be potentially exploited to run arbitrary commands remotely on compromised hosts under specific conditions. "This vulnerability allows a remote attacker to potentially execute arbitrary commands on vulnerable OpenSSH's forwarded ssh-agent," Saeed Abbasi, manager of vulnerability research at Qualys, said in an analysis last week.
The PKCS#11 feature in ssh-agent in OpenSSH versions prior to 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if an agent is forwarded to an attacker-controlled system.
The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if an agent is forwarded to an attacker-controlled system. (Code in /usr/lib is not necessarily safe for loading into ssh-agent.) NOTE: this issue exists because of an incomplete fix for CVE-2016-10009.