RHSA-2024:0538 - Security Advisory

Topic

An update for libssh is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.

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

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

• libssh: NULL pointer dereference during rekeying with algorithm guessing (CVE-2023-1667)
• libssh: authorization bypass in pki_verify_data_signature (CVE-2023-2283)
• ssh: Prefix truncation attack on Binary Packet Protocol (BPP) (CVE-2023-48795)

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

After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support Extension 8.6 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.6 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.6 ppc64le
• Red Hat Enterprise Linux Server - TUS 8.6 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.6 aarch64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.6 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.6 x86_64

Fixes

• BZ - 2182199 - CVE-2023-1667 libssh: NULL pointer dereference during rekeying with algorithm guessing
• BZ - 2189736 - CVE-2023-2283 libssh: authorization bypass in pki_verify_data_signature
• BZ - 2254210 - CVE-2023-48795 ssh: Prefix truncation attack on Binary Packet Protocol (BPP)

CVEs

• CVE-2023-1667
• CVE-2023-2283
• CVE-2023-48795

References

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