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Debian alert DSA-2303-2 (linux-2.6)

From:  dann frazier <>
Subject:  [SECURITY] [DSA 2303-2] New linux-2.6 packages fix regression
Date:  Sat, 10 Sep 2011 20:06:57 -0600
Message-ID:  <>
Archive-link:  Article, Thread

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - ---------------------------------------------------------------------- Debian Security Advisory DSA-2303-2 Dann Frazier September 10, 2011 - ---------------------------------------------------------------------- Package : linux-2.6 Vulnerability : privilege escalation/denial of service/information leak Problem type : local/remote Debian-specific: no CVE Id(s) : CVE-2011-1020 CVE-2011-1576 CVE-2011-2484 CVE-2011-2491 CVE-2011-2492 CVE-2011-2495 CVE-2011-2496 CVE-2011-2497 CVE-2011-2517 CVE-2011-2525 CVE-2011-2700 CVE-2011-2723 CVE-2011-2905 CVE-2011-2909 CVE-2011-2918 CVE-2011-2928 CVE-2011-3188 CVE-2011-3191 Debian Bug : 640966 The linux-2.6 and user-mode-linux upgrades from DSA-2303-1 has caused a regression that can result in an oops during invalid accesses to /proc/<pid>/maps files. The text of the original advisory is reproduced for reference: Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2011-1020 Kees Cook discovered an issue in the /proc filesystem that allows local users to gain access to sensitive process information after execution of a setuid binary. CVE-2011-1576 Ryan Sweat discovered an issue in the VLAN implementation. Local users may be able to cause a kernel memory leak, resulting in a denial of service. CVE-2011-2484 Vasiliy Kulikov of Openwall discovered that the number of exit handlers that a process can register is not capped, resulting in local denial of service through resource exhaustion (cpu time and memory). CVE-2011-2491 Vasily Averin discovered an issue with the NFS locking implementation. A malicious NFS server can cause a client to hang indefinitely in an unlock call. CVE-2011-2492 Marek Kroemeke and Filip Palian discovered that uninitialized struct elements in the Bluetooth subsystem could lead to a leak of sensitive kernel memory through leaked stack memory. CVE-2011-2495 Vasiliy Kulikov of Openwall discovered that the io file of a process' proc directory was world-readable, resulting in local information disclosure of information such as password lengths. CVE-2011-2496 Robert Swiecki discovered that mremap() could be abused for local denial of service by triggering a BUG_ON assert. CVE-2011-2497 Dan Rosenberg discovered an integer underflow in the Bluetooth subsystem, which could lead to denial of service or privilege escalation. CVE-2011-2517 It was discovered that the netlink-based wireless configuration interface performed insufficient length validation when parsing SSIDs, resulting in buffer overflows. Local users with the CAP_NET_ADMIN capability can cause a denial of service. CVE-2011-2525 Ben Pfaff reported an issue in the network scheduling code. A local user could cause a denial of service (NULL pointer dereference) by sending a specially crafted netlink message. CVE-2011-2700 Mauro Carvalho Chehab of Red Hat reported a buffer overflow issue in the driver for the Si4713 FM Radio Transmitter driver used by N900 devices. Local users could exploit this issue to cause a denial of service or potentially gain elevated privileges. CVE-2011-2723 Brent Meshier reported an issue in the GRO (generic receive offload) implementation. This can be exploited by remote users to create a denial of service (system crash) in certain network device configurations. CVE-2011-2905 Christian Ohm discovered that the 'perf' analysis tool searches for its config files in the current working directory. This could lead to denial of service or potential privilege escalation if a user with elevated privileges is tricked into running 'perf' in a directory under the control of the attacker. CVE-2011-2909 Vasiliy Kulikov of Openwall discovered that a programming error in the Comedi driver could lead to the information disclosure through leaked stack memory. CVE-2011-2918 Vince Weaver discovered that incorrect handling of software event overflows in the 'perf' analysis tool could lead to local denial of service. CVE-2011-2928 Timo Warns discovered that insufficient validation of Be filesystem images could lead to local denial of service if a malformed filesystem image is mounted. CVE-2011-3188 Dan Kaminsky reported a weakness of the sequence number generation in the TCP protocol implementation. This can be used by remote attackers to inject packets into an active session. CVE-2011-3191 Darren Lavender reported an issue in the Common Internet File System (CIFS). A malicious file server could cause memory corruption leading to a denial of service. This update also includes a fix for a regression introduced with the previous security fix for CVE-2011-1768 (Debian: #633738) For the stable distribution (squeeze), this problem has been fixed in version 2.6.32-35squeeze2. Updates for issues impacting the oldstable distribution (lenny) will be available soon. The following matrix lists additional source packages that were rebuilt for compatibility with or to take advantage of this update: Debian 6.0 (squeeze) user-mode-linux 2.6.32-1um-4+35squeeze2 We recommend that you upgrade your linux-2.6 and user-mode-linux packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: Mailing list: -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAEBAgAGBQJOa7gPAAoJEBv4PF5U/IZAhyoP/1VRIeUGZPmOMBIIUWfPP5Vt LJzj2kXbNmk6GpSJaO23mTZSq9XdrGP9aPpkTQY/QRsH5/nVEr6Djq4X/ld07l2U M3M8/ufVrdht/evuS37nriTKQ3+wuN8N2e2uP6ZPV3ez+PO6r5eh2QdjotMNOA8P CnF1VuLXOm0WguxOFFekbM6XjYCovSeFz6V2vIpdSZlDAVcBjW8Qrb/elSDY43rb yNWt61V05ihNnlhIDZwT2Q8QJ2aR27VIsNxZbnualV3iT3f+A+pX7Mix8mgZkbvp ZDHQ+gV2xr0D0zBO8JOa7CCkqhp0TQKiATD6ix2ZcjehmqtwB0HxQx074o2OVKA3 vL7UaEd8aY06VcUsW2KutjK3qjfWKEMmgp/aI9jP6wpJOi7GUxiUc2vK/e1Ksw95 dYe9tP1QmSKW5IFHeJauIgWWT1ERe3ofa8UGT7Z9Y3zExjDwesNzqf2OlYCuS4g4 d4wvkLZsKB+e9Xy6TDSdqLL66CIwHhOc50iI8F2fC02RJrxE3WICePmdCAJd/lrQ 2IeXkeq0hEjW3vOFKgp1/ta6fOjQNNev/1w/BZK6b/9UZf8LOmT2lKZQXlbcSoE4 Iztr47uj/w1/fjFjfBntwX93sPrDGQP1/kwppLCeWOsoTYL4Nh2cpTm5mRTH8qH9 PRLlyhdV4oDL0uqQwYo5 =ffJs -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to with a subject of "unsubscribe". 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