Debian Security Advisory

DSA-921-1 kernel-source-2.4.27 -- several vulnerabilities

Date Reported:
14 Dec 2005
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 311164, Bug 319629, Bug 321401, Bug 322237.
In the Bugtraq database (at SecurityFocus): BugTraq ID 14477.
In Mitre's CVE dictionary: CVE-2005-0756, CVE-2005-0757, CVE-2005-1762, CVE-2005-1767, CVE-2005-1768, CVE-2005-2456, CVE-2005-2458, CVE-2005-2459, CVE-2005-2553, CVE-2005-2801, CVE-2005-2872, CVE-2005-3275.
More information:

Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2005-0756

    Alexander Nyberg discovered that the ptrace() system call does not properly verify addresses on the amd64 architecture which can be exploited by a local attacker to crash the kernel.

  • CVE-2005-0757

    A problem in the offset handling in the xattr file system code for ext3 has been discovered that may allow users on 64-bit systems that have access to an ext3 filesystem with extended attributes to cause the kernel to crash.

  • CVE-2005-1762

    A vulnerability has been discovered in the ptrace() system call on the amd64 architecture that allows a local attacker to cause the kernel to crash.

  • CVE-2005-1767

    A vulnerability has been discovered in the stack segment fault handler that could allow a local attacker to cause a stack exception that will lead the kernel to crash under certain circumstances.

  • CVE-2005-1768

    Ilja van Sprundel discovered a race condition in the IA32 (x86) compatibility execve() systemcall for amd64 and IA64 that allows local attackers to cause the kernel to panic and possibly execute arbitrary code.

  • CVE-2005-2456

    Balazs Scheidler discovered that a local attacker could call setsockopt() with an invalid xfrm_user policy message which would cause the kernel to write beyond the boundaries of an array and crash.

  • CVE-2005-2458

    Vladimir Volovich discovered a bug in the zlib routines which are also present in the Linux kernel and allows remote attackers to crash the kernel.

  • CVE-2005-2459

    Another vulnerability has been discovered in the zlib routines which are also present in the Linux kernel and allows remote attackers to crash the kernel.

  • CVE-2005-2553

    A null pointer dereference in ptrace when tracing a 64-bit executable can cause the kernel to crash.

  • CVE-2005-2801

    Andreas Gruenbacher discovered a bug in the ext2 and ext3 file systems. When data areas are to be shared among two inodes not all information were compared for equality, which could expose wrong ACLs for files.

  • CVE-2005-2872

    Chad Walstrom discovered that the ipt_recent kernel module to stop SSH bruteforce attacks could cause the kernel to crash on 64-bit architectures.

  • CVE-2005-3275

    An error in the NAT code allows remote attackers to cause a denial of service (memory corruption) by causing two packets for the same protocol to be NATed at the same time, which leads to memory corruption.

The following matrix explains which kernel version for which architecture fix the problems mentioned above:

  Debian 3.1 (sarge)
Source 2.4.27-10sarge1
Alpha architecture 2.4.27-10sarge1
ARM architecture 2.4.27-2sarge1
Intel IA-32 architecture 2.4.27-10sarge1
Intel IA-64 architecture 2.4.27-10sarge1
Motorola 680x0 architecture 2.4.27-3sarge1
Big endian MIPS architecture 2.4.27-10.sarge1.040815-1
Little endian MIPS architecture 2.4.27-10.sarge1.040815-1
PowerPC architecture 2.4.27-10sarge1
IBM S/390 architecture 2.4.27-2sarge1
Sun Sparc architecture 2.4.27-9sarge1

We recommend that you upgrade your kernel package immediately and reboot the machine.

Fixed in:

Debian GNU/Linux 3.1 (sarge)

Architecture-independent component:
Intel IA-32:
Intel IA-64:
Motorola 680x0:
Big endian MIPS:
Little endian MIPS:
IBM S/390:
Sun Sparc:

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