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-2004-2731 infamous41md reported multiple integer overflows in the Sbus PROM driver that would allow for a DoS (Denial of Service) attack by a local user, and possibly the execution of arbitrary code. CVE-2006-4814 Doug Chapman discovered a potential local DoS (deadlock) in the mincore function caused by improper lock handling. CVE-2006-5753 Eric Sandeen provided a fix for a local memory corruption vulnerability resulting from a misinterpretation of return values when operating on inodes which have been marked bad. CVE-2006-5823 LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted cramfs filesystem. CVE-2006-6053 LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted ext3 filesystem. CVE-2006-6054 LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted ext2 filesystem. CVE-2006-6106 Marcel Holtman discovered multiple buffer overflows in the Bluetooth subsystem which can be used to trigger a remote DoS (crash) and potentially execute arbitrary code. CVE-2007-1353 Ilja van Sprundel discovered that kernel memory could be leaked via the Bluetooth setsockopt call due to an uninitialized stack buffer. This could be used by local attackers to read the contents of sensitive kernel memory. CVE-2007-1592 Masayuki Nakagawa discovered that flow labels were inadvertently being shared between listening sockets and child sockets. This defect can be exploited by local users to cause a DoS (Oops). CVE-2007-2172 Thomas Graf reported a typo in the DECnet protocol handler that could be used by a local attacker to overrun an array via crafted packets, potentially resulting in a Denial of Service (system crash). A similar issue exists in the IPV4 protocol handler and will be fixed in a subsequent update. CVE-2007-2525 Florian Zumbiehl discovered a memory leak in the PPPOE subsystem caused by releasing a socket before PPPIOCGCHAN is called upon it. This could be used by a local user to DoS a system by consuming all available memory. CVE-2007-3848 Wojciech Purczynski discovered that pdeath_signal was not being reset properly under certain conditions which may allow local users to gain privileges by sending arbitrary signals to suid binaries. CVE-2007-4308 Alan Cox reported an issue in the aacraid driver that allows unprivileged local users to make ioctl calls which should be restricted to admin privileges. CVE-2007-4311 PaX team discovered an issue in the random driver where a defect in the reseeding code leads to a reduction in entropy. CVE-2007-5093 Alex Smith discovered an issue with the pwc driver for certain webcam devices. If the device is removed while a userspace application has it open, the driver will wait for userspace to close the device, resulting in a blocked USB subsystem. This issue is of low security impact as it requires the attacker to either have physical access to the system or to convince a user with local access to remove the device on their behalf. CVE-2007-6063 Venustech AD-LAB discovered a a buffer overflow in the isdn ioctl handling, exploitable by a local user. CVE-2007-6151 ADLAB discovered a possible memory overrun in the ISDN subsystem that may permit a local user to overwrite kernel memory by issuing ioctls with unterminated data. CVE-2007-6206 Blake Frantz discovered that when a core file owned by a non-root user exists, and a root-owned process dumps core over it, the core file retains its original ownership. This could be used by a local user to gain access to sensitive information. CVE-2007-6694 Cyrill Gorcunov reported a NULL pointer dereference in code specific to the CHRP PowerPC platforms. Local users could exploit this issue to achieve a Denial of Service (DoS). CVE-2008-0007 Nick Piggin of SuSE discovered a number of issues in subsystems which register a fault handler for memory mapped areas. This issue can be exploited by local users to achieve a Denial of Service (DoS) and possibly execute arbitrary code. The following matrix lists additional packages that were rebuilt for compatibility with or to take advantage of this update: Debian 3.1 (sarge) alsa-modules-i386 1.0.8+2sarge2 kernel-image-2.4.27-arm 2.4.27-2sarge6 kernel-image-2.4.27-m68k 2.4.27-3sarge6 kernel-image-speakup-i386 2.4.27-1.1sarge5 kernel-image-2.4.27-alpha 2.4.27-10sarge6 kernel-image-2.4.27-s390 2.4.27-2sarge6 kernel-image-2.4.27-sparc 2.4.27-9sarge6 kernel-image-2.4.27-i386 2.4.27-10sarge6 kernel-image-2.4.27-ia64 2.4.27-10sarge6 kernel-patch-2.4.27-mips 2.4.27-10.sarge4.040815-3 kernel-patch-powerpc-2.4.272.4.27-10sarge6 kernel-latest-2.4-alpha 101sarge3 kernel-latest-2.4-i386 101sarge2 kernel-latest-2.4-s390 2.4.27-1sarge2 kernel-latest-2.4-sparc 42sarge3 i2c 1:2.9.1-1sarge2 lm-sensors 1:2.9.1-1sarge4 mindi-kernel 2.4.27-2sarge5 pcmcia-modules-2.4.27-i386 3.2.5+2sarge2 hostap-modules-i386 1:0.3.7-1sarge3 systemimager 3.2.3-6sarge5 We recommend that you upgrade your kernel package immediately and reboot the machine. If you have built a custom kernel from the kernel source package, you will need to rebuild to take advantage of these fixes.
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:
infamous41md reported multiple integer overflows in the Sbus PROM driver that would allow for a DoS (Denial of Service) attack by a local user, and possibly the execution of arbitrary code.
Doug Chapman discovered a potential local DoS (deadlock) in the mincore function caused by improper lock handling.
Eric Sandeen provided a fix for a local memory corruption vulnerability resulting from a misinterpretation of return values when operating on inodes which have been marked bad.
LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted cramfs filesystem.
LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted ext3 filesystem.
LMH reported a potential local DoS which could be exploited by a malicious user with the privileges to mount and read a corrupted ext2 filesystem.
Marcel Holtman discovered multiple buffer overflows in the Bluetooth subsystem which can be used to trigger a remote DoS (crash) and potentially execute arbitrary code.
Ilja van Sprundel discovered that kernel memory could be leaked via the Bluetooth setsockopt call due to an uninitialized stack buffer. This could be used by local attackers to read the contents of sensitive kernel memory.
Masayuki Nakagawa discovered that flow labels were inadvertently being shared between listening sockets and child sockets. This defect can be exploited by local users to cause a DoS (Oops).
Thomas Graf reported a typo in the DECnet protocol handler that could be used by a local attacker to overrun an array via crafted packets, potentially resulting in a Denial of Service (system crash). A similar issue exists in the IPV4 protocol handler and will be fixed in a subsequent update.
Florian Zumbiehl discovered a memory leak in the PPPOE subsystem caused by releasing a socket before PPPIOCGCHAN is called upon it. This could be used by a local user to DoS a system by consuming all available memory.
Wojciech Purczynski discovered that pdeath_signal was not being reset properly under certain conditions which may allow local users to gain privileges by sending arbitrary signals to suid binaries.
Alan Cox reported an issue in the aacraid driver that allows unprivileged local users to make ioctl calls which should be restricted to admin privileges.
PaX team discovered an issue in the random driver where a defect in the reseeding code leads to a reduction in entropy.
Alex Smith discovered an issue with the pwc driver for certain webcam devices. If the device is removed while a userspace application has it open, the driver will wait for userspace to close the device, resulting in a blocked USB subsystem. This issue is of low security impact as it requires the attacker to either have physical access to the system or to convince a user with local access to remove the device on their behalf.
Venustech AD-LAB discovered a a buffer overflow in the isdn ioctl handling, exploitable by a local user.
ADLAB discovered a possible memory overrun in the ISDN subsystem that may permit a local user to overwrite kernel memory by issuing ioctls with unterminated data.
Blake Frantz discovered that when a core file owned by a non-root user exists, and a root-owned process dumps core over it, the core file retains its original ownership. This could be used by a local user to gain access to sensitive information.
Cyrill Gorcunov reported a NULL pointer dereference in code specific to the CHRP PowerPC platforms. Local users could exploit this issue to achieve a Denial of Service (DoS).
Nick Piggin of SuSE discovered a number of issues in subsystems which register a fault handler for memory mapped areas. This issue can be exploited by local users to achieve a Denial of Service (DoS) and possibly execute arbitrary code.
The following matrix lists additional packages that were rebuilt for compatibility with or to take advantage of this update:
| Debian 3.1 (sarge) | |
|---|---|
| alsa-modules-i386 | 1.0.8+2sarge2 |
| kernel-image-2.4.27-arm | 2.4.27-2sarge6 |
| kernel-image-2.4.27-m68k | 2.4.27-3sarge6 |
| kernel-image-speakup-i386 | 2.4.27-1.1sarge5 |
| kernel-image-2.4.27-alpha | 2.4.27-10sarge6 |
| kernel-image-2.4.27-s390 | 2.4.27-2sarge6 |
| kernel-image-2.4.27-sparc | 2.4.27-9sarge6 |
| kernel-image-2.4.27-i386 | 2.4.27-10sarge6 |
| kernel-image-2.4.27-ia64 | 2.4.27-10sarge6 |
| kernel-patch-2.4.27-mips | 2.4.27-10.sarge4.040815-3 |
| kernel-patch-powerpc-2.4.27 | 2.4.27-10sarge6 |
| kernel-latest-2.4-alpha | 101sarge3 |
| kernel-latest-2.4-i386 | 101sarge2 |
| kernel-latest-2.4-s390 | 2.4.27-1sarge2 |
| kernel-latest-2.4-sparc | 42sarge3 |
| i2c | 1:2.9.1-1sarge2 |
| lm-sensors | 1:2.9.1-1sarge4 |
| mindi-kernel | 2.4.27-2sarge5 |
| pcmcia-modules-2.4.27-i386 | 3.2.5+2sarge2 |
| hostap-modules-i386 | 1:0.3.7-1sarge3 |
| systemimager | 3.2.3-6sarge5 |
We recommend that you upgrade your kernel package immediately and reboot the machine. If you have built a custom kernel from the kernel source package, you will need to rebuild to take advantage of these fixes.
MD5 checksums of the listed files are available in the original advisory.
Vulmon