ALAS2-2023-2176

Amazon Linux 2 Security Advisory: ALAS-2023-2176
Advisory Release Date: 2023-08-03 18:09 Pacific
Advisory Updated Date: 2023-08-08 22:03 Pacific
Severity: Important
Issue Overview:

The PKCS#11 feature in ssh-agent in OpenSSH before 9.3p2 has an insufficiently trustworthy search path, leading to remote code execution if the target user's ssh-agent is forwarded to an attacker-controlled system (the code in /usr/lib is not necessarily safe for loading into ssh-agent). Exploitation can also be prevented by starting ssh-agent with an empty PKCS#11/FIDO allowlist (ssh-agent -P '') or by configuring an allowlist that contains only specific provider libraries. NOTE: this issue exists because of an incomplete fix for CVE-2016-10009. (CVE-2023-38408)


Affected Packages:

openssh


Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.


Issue Correction:
Run yum update openssh to update your system.

New Packages:
aarch64:
    openssh-7.4p1-22.amzn2.0.3.aarch64
    openssh-clients-7.4p1-22.amzn2.0.3.aarch64
    openssh-server-7.4p1-22.amzn2.0.3.aarch64
    openssh-server-sysvinit-7.4p1-22.amzn2.0.3.aarch64
    openssh-ldap-7.4p1-22.amzn2.0.3.aarch64
    openssh-keycat-7.4p1-22.amzn2.0.3.aarch64
    openssh-askpass-7.4p1-22.amzn2.0.3.aarch64
    openssh-cavs-7.4p1-22.amzn2.0.3.aarch64
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.3.aarch64
    openssh-debuginfo-7.4p1-22.amzn2.0.3.aarch64

i686:
    openssh-7.4p1-22.amzn2.0.3.i686
    openssh-clients-7.4p1-22.amzn2.0.3.i686
    openssh-server-7.4p1-22.amzn2.0.3.i686
    openssh-server-sysvinit-7.4p1-22.amzn2.0.3.i686
    openssh-ldap-7.4p1-22.amzn2.0.3.i686
    openssh-keycat-7.4p1-22.amzn2.0.3.i686
    openssh-askpass-7.4p1-22.amzn2.0.3.i686
    openssh-cavs-7.4p1-22.amzn2.0.3.i686
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.3.i686
    openssh-debuginfo-7.4p1-22.amzn2.0.3.i686

src:
    openssh-7.4p1-22.amzn2.0.3.src

x86_64:
    openssh-7.4p1-22.amzn2.0.3.x86_64
    openssh-clients-7.4p1-22.amzn2.0.3.x86_64
    openssh-server-7.4p1-22.amzn2.0.3.x86_64
    openssh-server-sysvinit-7.4p1-22.amzn2.0.3.x86_64
    openssh-ldap-7.4p1-22.amzn2.0.3.x86_64
    openssh-keycat-7.4p1-22.amzn2.0.3.x86_64
    openssh-askpass-7.4p1-22.amzn2.0.3.x86_64
    openssh-cavs-7.4p1-22.amzn2.0.3.x86_64
    pam_ssh_agent_auth-0.10.3-2.22.amzn2.0.3.x86_64
    openssh-debuginfo-7.4p1-22.amzn2.0.3.x86_64

Additional References

Red Hat: CVE-2023-38408

Mitre: CVE-2023-38408