DSA 514-1: New Linux 2.2.20 packages fix local root exploit (sparc)

Updated kernel 2.2.20 packages has been released for Debian GNU/Linux (sparc)

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Debian Security Advisory DSA 514-1 security@debian.org
http://www.debian.org/security/ Martin Schulze
June 4th, 2004 http://www.debian.org/security/faq
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Package : kernel-source-2.2.20, kernel-image-2.2-sparc
Vulnerability : failing function and TLB flush
Problem-Type : local
Debian-specific: no
CVE ID : CAN-2004-0077
CERT advisory : VU#981222

Paul Starzetz and Wojciech Purczynski of isec.pl discovered a critical security vulnerability in the memory management code of Linux inside the mremap(2) system call. Due to flushing the TLB (Translation Lookaside Buffer, an address cache) too early it is possible for an attacker to trigger a local root exploit.

The attack vectors for 2.4.x and 2.2.x kernels are exclusive for the respective kernel series, though. We formerly believed that the exploitable vulnerability in 2.4.x does not exist in 2.2.x which is still true. However, it turned out that a second (sort of) vulnerability is indeed exploitable in 2.2.x, but not in 2.4.x, with a
different exploit, of course.

For the stable distribution (woody) these problems have been fixed in version 9woody1 of Linux 2.2 kernel images for the sparc architecture and in version 2.2.20-5woody3 of Linux 2.2.20 source.

For the unstable distribution (sid) these problems have been fixed in version 9.1 of Linux 2.2 kernel images for the sparc architecture.

This problem has been fixed for other architectures already.

We recommend that you upgrade your Linux kernel package.

Upgrade Instructions
---------------------

wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.

If you are using the apt-get package manager, use the line for sources.list as given below:

apt-get update
will update the internal database
apt-get upgrade
will install corrected packages

You may use an automated update by adding the resources from the footer to the proper configuration.


Debian GNU/Linux 3.0 alias woody
---------------------------------

Source archives:

http://security.debian.org/pool/updates/main/k/kernel-source-2.2.20/kernel-source-2.2.20_2.2.20-5woody3.dsc
Size/MD5 checksum: 661 4eede8cde6013e6660459173dacd8e4e
http://security.debian.org/pool/updates/main/k/kernel-source-2.2.20/kernel-source-2.2.20_2.2.20-5woody3.diff.gz
Size/MD5 checksum: 159991 26db63a4af138d5c67c433da29778102
http://security.debian.org/pool/updates/main/k/kernel-source-2.2.20/kernel-source-2.2.20_2.2.20.orig.tar.gz
Size/MD5 checksum: 19394649 57c0edf86cb23a5b215db9121c9b3557

http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-sparc-2.2_9woody1.dsc
Size/MD5 checksum: 768 58d7d78f4cc97af50074cafa2322ca7c
http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-sparc-2.2_9woody1.tar.gz
Size/MD5 checksum: 25540 af1005c87ca491c28108fda2a66efb2c

Architecture independent components:

http://security.debian.org/pool/updates/main/k/kernel-source-2.2.20/kernel-doc-2.2.20_2.2.20-5woody3_all.deb
Size/MD5 checksum: 1162414 d244e1206d51a785d2a298df8ffbb9e8
http://security.debian.org/pool/updates/main/k/kernel-source-2.2.20/kernel-source-2.2.20_2.2.20-5woody3_all.deb
Size/MD5 checksum: 15848780 33170e34a3d4c56e910314be93f0b184

http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-headers-2.2.20-sparc_9woody1_all.deb
Size/MD5 checksum: 1122094 e5bdced5ca4b46cffec44e531c238a56

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-2.2.20-sun4cdm_9woody1_sparc.deb
Size/MD5 checksum: 1617420 3789f331d7aa2e9c10b3ffee08c82b94
http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-2.2.20-sun4dm-smp_9woody1_sparc.deb
Size/MD5 checksum: 1653324 e0b6db9b869d1dd51e2a615a0eaef8a1
http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-2.2.20-sun4u_9woody1_sparc.deb
Size/MD5 checksum: 2023252 50b820b56ed032a532d5e0bbff5f58b1
http://security.debian.org/pool/updates/main/k/kernel-image-sparc-2.2/kernel-image-2.2.20-sun4u-smp_9woody1_sparc.deb
Size/MD5 checksum: 2066292 9144adfbf2bce6098028b69ee28658b8


These files will probably be moved into the stable distribution on its next revision.