This e-mail of Greig's was auto-discarded... Luckily I get a copy of all discarded messages, so here it is: (another reminder -- remember the address you subscribed with, or subscribe them all!) ----begin-forward---- For those using custom kernels...update! :) -----Original Message----- From: debian-security-announce(a)lists.debian.org [mailto:debian-security-announce(a)lists.debian.org] Sent: Tuesday, 2 December 2003 9:17 a.m. To: full-disclosure(a)lists.netsys.com Subject: [Full-Disclosure] [SECURITY] [DSA-403-1] userland can access Linux kernel memory -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - ------------------------------------------------------------------------ Debian Security Advisory DSA-403-1 security(a)debian.org http://www.debian.org/security/ Wichert Akkerman December 1, 2003 - ------------------------------------------------------------------------ Package : kernel-image-2.4.18-1-alpha, kernel-image-2.4.18-1-i386, kernel-source-2.4.18 Vulnerability : userland can access full kernel memory Problem type : local Debian-specific: no CVE Id(s) : CAN-2003-0961 Recently multiple servers of the Debian project were compromised using a Debian developers account and an unknown root exploit. Forensics revealed a burneye encrypted exploit. Robert van der Meulen managed to decrypt the binary which revealed a kernel exploit. Study of the exploit by the RedHat and SuSE kernel and security teams quickly revealed that the exploit used an integer overflow in the brk system call. Using this bug it is possible for a userland program to trick the kernel into giving access to the full kernel address space. This problem was found in September by Andrew Morton, but unfortunately that was too late for the 2.4.22 kernel release. This bug has been fixed in kernel version 2.4.23 for the 2.4 tree and 2.6.0-test6 kernel tree. For Debian it has been fixed in version 2.4.18-12 of the kernel source packages, version 2.4.18-14 of the i386 kernel images and version 2.4.18-11 of the alpha kernel images. 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 3.0 (stable) - ------------------- Source archives: http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-i386/ke rnel-image-2.4.18-1-i386_2.4.18-12.tar.gz Size/MD5 checksum: 69746 a4b642e03732748d6820524746ba2265 http://security.debian.org/pool/updates/main/k/kernel-source-2.4.18/kernel-s ource-2.4.18_2.4.18.orig.tar.gz Size/MD5 checksum: 29818323 24b4c45a04a23eb4ce465eb326a6ddf2 http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-alpha/k ernel-image-2.4.18-1-alpha_2.4.18-11.dsc Size/MD5 checksum: 874 6fe1a9a759850570f1609b77502c13bc http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-alpha/k ernel-image-2.4.18-1-alpha_2.4.18-11.tar.gz Size/MD5 checksum: 24210 11373e2cf7e659f5a69c33f3f143fcaf http://security.debian.org/pool/updates/main/k/kernel-source-2.4.18/kernel-s ource-2.4.18_2.4.18-14.dsc Size/MD5 checksum: 798 14840782d3ae928fd453a7dba225bb7f http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-i386/ke rnel-image-2.4.18-1-i386_2.4.18-12.dsc Size/MD5 checksum: 1325 a77acb0743f3d3a16c00fa1cd4520e89 http://security.debian.org/pool/updates/main/k/kernel-source-2.4.18/kernel-s ource-2.4.18_2.4.18-14.diff.gz Size/MD5 checksum: 66878 916d16dd46c59dd4314c45e48f33f043 Architecture independent packages: http://security.debian.org/pool/updates/main/k/kernel-source-2.4.18/kernel-d oc-2.4.18_2.4.18-14_all.deb Size/MD5 checksum: 1710438 5e6cb496150391a93558652c97fb214b http://security.debian.org/pool/updates/main/k/kernel-source-2.4.18/kernel-s ource-2.4.18_2.4.18-14_all.deb Size/MD5 checksum: 23903282 9d5cb5159bf76451dd32e75467ca6240 alpha architecture (DEC Alpha) http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-alpha/k ernel-headers-2.4.18-1-smp_2.4.18-11_alpha.deb Size/MD5 checksum: 3514858 ec88046377537587469e5527f3633c65 http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-alpha/k ernel-headers-2.4.18-1_2.4.18-11_alpha.deb Size/MD5 checksum: 3362836 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43c7a34c6428e7d79fb660b4a434aaae http://security.debian.org/pool/updates/main/k/kernel-image-2.4.18-1-i386/ke rnel-image-2.4.18-1-686_2.4.18-12_i386.deb Size/MD5 checksum: 8703034 a6d0829412575a9f7e6c227c5275a47b - -- - ---------------------------------------------------------------------------- Debian Security team <team(a)security.debian.org> http://www.debian.org/security/ Mailing-List: debian-security-announce(a)lists.debian.org -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQE/y6HGPLiSUC+jvC0RAnd9AKCKvn969KiqvmErdGNv1iJSgzTVxwCbBkWB IZdDr8fKKloX6PSe+tPOW68= =nGzM -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html -- Kim Shepherd Systems Operator/Administrator ITS Systems & Development The University of Waikato, NZ DDI: +64-7-838-4681 Mob: +64-27-240-8682 Mail: kims(a)waikato.ac.nz