Debian alert: New Linux 2.2.22 packages fix local root exploit (alpha)

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- -------------------------------------------------------------------------- Debian Security Advisory DSA 454-1 [e-mail:security@debian.org] http://www.debian.org/security/ Martin Schulze March 2nd, 2004 http://www.debian.org/security/faq - --------------------------------------------------------------------------

Package : kernel-source-2.2.22, kernel-image-2.2.22-alpha Vulnerability : failing function and TLB flush Problem-Type : local Debian-specific: no CVE ID : CAN-2004-0077

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) this problem has been fixed in the following versions and architectures:

kernel-source-2.2.22 source 2.2.22-1woody1 kernel-image-2.2.22-alpha alpha 2.2.22-2

For the unstable distribution (sid) this problem will be fixed soon for the architectures that still ship a 2.2.x kernel package.

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-2.2.22/kernel-source-2.2.22_2.2.22-1woody1.dsc Size/MD5 checksum: 661 2f5744d0e7d68932d8910d15583ed820 http://security.debian.org/pool/updates/main/k/kernel-source-2.2.22/kernel-source-2.2.22_2.2.22-1woody1.diff.gz Size/MD5 checksum: 146548 51478245f5608894bbb59223172f9cb3 http://security.debian.org/pool/updates/main/k/kernel-source-2.2.22/kernel-source-2.2.22_2.2.22.orig.tar.gz Size/MD5 checksum: 19313552 af9832dc10026cf03b2682f296ccd051

http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-alpha_2.2.22-2.dsc Size/MD5 checksum: 870 ac538b47a782ae11686e2c5d0c3bb6f5 http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-alpha_2.2.22-2.tar.gz Size/MD5 checksum: 7451 6107bb5e1e7ae0aa4e3f9417fced0717

Architecture independent components:

http://security.debian.org/pool/updates/main/k/kernel-source-2.2.22/kernel-doc-2.2.22_2.2.22-1woody1_all.deb Size/MD5 checksum: 1162368 805cf7d09f69b14ebcb392038de5a6b1 http://security.debian.org/pool/updates/main/k/kernel-source-2.2.22/kernel-source-2.2.22_2.2.22-1woody1_all.deb Size/MD5 checksum: 15759754 55d31894b93cb9633caaa6a0eddbf998

Alpha architecture:

http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-headers-2.2.22_2.2.22-2_alpha.deb Size/MD5 checksum: 1871248 c762109e412ef7d3e31bebb868e668ce http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-generic_2.2.22-2_alpha.deb Size/MD5 checksum: 2782898 99c876bdab97812cb5ebdfdb1c88d224 http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-jensen_2.2.22-2_alpha.deb Size/MD5 checksum: 2299174 ac17d87dbb6558c83b723fb97808f721 http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-nautilus_2.2.22-2_alpha.deb Size/MD5 checksum: 2537032 9a3194224faccec6081ee06d9926be09 http://security.debian.org/pool/updates/main/k/kernel-image-2.2.22-alpha/kernel-image-2.2.22-smp_2.2.22-2_alpha.deb Size/MD5 checksum: 2878172 6ad070e82c301504d845692688012fed

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

- --------------------------------------------------------------------------------- For apt-get: deb http://security.debian.org/ stable/updates main For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main Mailing list: [e-mail:debian-security-announce@lists.debian.org] Package info: 'apt-cache show ' and http://packages.debian.org/

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