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[slackware-security]  openssh (SSA:2023-200-02)

New openssh packages are available for Slackware 15.0 and -current to
fix a security issue.


Here are the details from the Slackware 15.0 ChangeLog:
+--------------------------+
patches/packages/openssh-9.3p2-i586-1_slack15.0.txz:  Upgraded.
  This update fixes a security issue:
  ssh-agent(1) in OpenSSH between and 5.5 and 9.3p1 (inclusive): remote code
  execution relating to PKCS#11 providers.
  The PKCS#11 support ssh-agent(1) could be abused to achieve remote code
  execution via a forwarded agent socket if the following conditions are met:
  * Exploitation requires the presence of specific libraries on the victim
    system.
  * Remote exploitation requires that the agent was forwarded to an
    attacker-controlled system.
  Exploitation can also be prevented by starting ssh-agent(1) with an empty
  PKCS#11/FIDO allowlist (ssh-agent -P '') or by configuring an allowlist that
  contains only specific provider libraries.
  This vulnerability was discovered and demonstrated to be exploitable by the
  Qualys Security Advisory team.
  Potentially-incompatible changes:
  * ssh-agent(8): the agent will now refuse requests to load PKCS#11 modules
  issued by remote clients by default. A flag has been added to restore the
  previous behaviour: "-Oallow-remote-pkcs11".
  For more information, see:
    https://www.openssh.com/txt/release-9.3p2
    https://www.cve.org/CVERecord?id=CVE-2023-38408
  (* Security fix *)
+--------------------------+


Where to find the 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://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-9.3p2-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-9.3p2-x86_64-1_slack15.0.txz

Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/openssh-9.3p2-i586-1.txz

Updated package for Slackware x86_64 -current:
ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/openssh-9.3p2-x86_64-1.txz


MD5 signatures:
+-------------+

Slackware 15.0 package:
f2083947439060e937a3e720c8ba2035  openssh-9.3p2-i586-1_slack15.0.txz

Slackware x86_64 15.0 package:
65bc59e75ee1b485ebbb2c5b744fd932  openssh-9.3p2-x86_64-1_slack15.0.txz

Slackware -current package:
95dc2417dcd41443872c894c693be90a  n/openssh-9.3p2-i586-1.txz

Slackware x86_64 -current package:
f41ca760cefc726afa5b0c8905d80907  n/openssh-9.3p2-x86_64-1.txz


Installation instructions:
+------------------------+

Upgrade the package as root:
# upgradepkg openssh-9.3p2-i586-1_slack15.0.txz

Next, restart the sshd daemon:
# sh /etc/rc.d/rc.sshd restart


+-----+

Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com

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