Debian Security Advisory

DSA-086-1 ssh-nonfree -- remote root exploit

Date Reported:
13 Nov 2001
Affected Packages:
ssh-nonfree, ssh-socks
Security database references:
In Mitre's CVE dictionary: CVE-2001-0361.
More information:

We have received reports that the "SSH CRC-32 compensation attack detector vulnerability" is being actively exploited. This is the same integer type error previously corrected for OpenSSH in DSA-027-1. OpenSSH (the Debian ssh package) was fixed at that time, but ssh-nonfree and ssh-socks were not.

Though packages in the non-free section of the archive are not officially supported by the Debian project, we are taking the unusual step of releasing updated ssh-nonfree/ssh-socks packages for those users who have not yet migrated to OpenSSH. However, we do recommend that our users migrate to the regularly supported, DFSG-free "ssh" package as soon as possible. ssh 1.2.3-9.3 is the OpenSSH package available in Debian 2.2r4.

The fixed ssh-nonfree/ssh-socks packages are available in version 1.2.27-6.2 for use with Debian 2.2 (potato) and version 1.2.27-8 for use with the Debian unstable/testing distribution. Note that the new ssh-nonfree/ssh-socks packages remove the setuid bit from the ssh binary, disabling rhosts-rsa authentication. If you need this functionality, run

chmod u+s /usr/bin/ssh1

after installing the new package.

Fixed in:

Debian GNU/Linux 2.2 (potato)

ARM: Not yet available
Intel ia32:
Motorola M680x0:
Sun Sparc:

MD5 checksums of the listed files are available in the original advisory.