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From: Slackware Security Team <security@slackware.com>
To: slackware-security@slackware.com
Subject: [slackware-security] openssh (SSA:2023-200-02)
Date: Wed, 19 Jul 2023 13:41:55 -0700 (PDT) |
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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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