RHSA-2025:23481 - Security Advisory

Topic

An update for openssh is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.

Security Fix(es):

• openssh: OpenSSH: Control characters in usernames can lead to code execution via ProxyCommand (CVE-2025-61984)
• openssh: OpenSSH: Null character in ssh:// URI can lead to code execution via ProxyCommand (CVE-2025-61985)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 2401960 - CVE-2025-61984 openssh: OpenSSH: Control characters in usernames can lead to code execution via ProxyCommand
• BZ - 2401962 - CVE-2025-61985 openssh: OpenSSH: Null character in ssh:// URI can lead to code execution via ProxyCommand

CVEs

• CVE-2025-61984
• CVE-2025-61985

References

• https://access.redhat.com/security/updates/classification/#moderate