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Slackware 15.0: SSA-2025-049-01 Critical: OpenSSH DoS and MITM

slackware
Calendar Grey February 18, 2025
Dist Slackware Esm H88
Enhance your OpenSSH packages for Slackware 15.0 to address significant vulnerabilities. Refer to the given sources for the updates.
New openssh packages are available for Slackware 15.0 and -current to fix security issues

Summary

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/openssh-9.9p2-i586-1_slack15.0.txz: Upgraded. This release fixes two security bugs: ssh(1) in OpenSSH versions 6.8p1 to 9.9p1 (inclusive) contained a logic error that allowed an on-path attacker (a.k.a MITM) to impersonate any server when the VerifyHostKeyDNS option is enabled. This option is off by default. sshd(8) in OpenSSH versions 9.5p1 to 9.9p1 (inclusive) is vulnerable to a memory/CPU denial-of-service related to the handling of SSH2_MSG_PING packets. This condition may be mitigated using the existing PerSourcePenalties feature. Both vulnerabilities were discovered and demonstrated to be exploitable by the Qualys Security Advisory team. We thank them for their detailed review of OpenSSH. For more information, see: https://www.openssh.org/txt/release-9.9p2 https://www.cve.org/CVERecord?id=CVE-2025-26465 https://www.cve.org/CVERecord?id=CVE-2025-26466 (* Security fix

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Topics%20covered

Topics Covered

security advisory denial of service slackware Slackware openssh man-in-the-middle OpenSSH network attack

Where Find New Packages

Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-)
Also see the "Get Slack" section on http://www.slackware.com/ for additional mirror sites near you.
Updated package for Slackware 15.0: ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/openssh-9.9p2-i586-1_slack15.0.txz
Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/openssh-9.9p2-x86_64-1_slack15.0.txz
Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssh-9.9p2-i686-1.txz
Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssh-9.9p2-x86_64-1.txz

MD5 Signatures

Slackware 15.0 package: 39086bf1a23389cdc3501560811ee229 openssh-9.9p2-i586-1_slack15.0.txz
Slackware x86_64 15.0 package: 1d74311eebcb7bc260aaeb23eb5ea8e4 openssh-9.9p2-x86_64-1_slack15.0.txz
Slackware -current package: 890e7f1c2dec14d89de25a6653faa10d n/openssh-9.9p2-i686-1.txz
Slackware x86_64 -current package: 63e31412b101ba3def8a4267d677e188 n/openssh-9.9p2-x86_64-1.txz

Severity
critical
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory denial of service slackware Slackware openssh man-in-the-middle OpenSSH network attack

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Installation Instructions

Installation instructions: Upgrade the package as root: # upgradepkg openssh-9.9p2-i586-1_slack15.0.txz Next, restart the sshd daemon: # sh /etc/rc.d/rc.sshd restart

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