Linux kernel 2.2.x allows local users to cause a denial of service (crash) by using the mmap() function with a PROT_READ parameter to access non-readable memory pages through the /proc/pid/mem interface.

A number of vulnerabilities have been discovered in the Linux kernel.

  - CAN-2002-1380: Linux kernel 2.2.x allows local users to     cause a denial of service (crash) by using the mmap()     function with a PROT_READ parameter to access     non-readable memory pages through the /proc/pid/mem     interface.
  - CVE-2002-0429: The iBCS routines in     arch/i386/kernel/traps.c for Linux kernels 2.4.18 and     earlier on x86 systems allow local users to kill     arbitrary processes via a binary compatibility interface     (lcall)

  - CAN-2003-0001: Multiple ethernet Network Interface Card     (NIC) device drivers do not pad frames with null bytes,     which allows remote attackers to obtain information from     previous packets or kernel memory by using malformed     packets

  - CAN-2003-0127: The kernel module loader allows local     users to gain root privileges by using ptrace to attach     to a child process that is spawned by the kernel

  - CAN-2003-0244: The route cache implementation in Linux     2.4, and the Netfilter IP conntrack module, allows     remote attackers to cause a denial of service (CPU     consumption) via packets with forged source addresses     that cause a large number of hash table collisions     related to the PREROUTING chain

  - CAN-2003-0246: The ioperm system call in Linux kernel     2.4.20 and earlier does not properly restrict     privileges, which allows local users to gain read or     write access to certain I/O ports.

  - CAN-2003-0247: vulnerability in the TTY layer of the     Linux kernel 2.4 allows attackers to cause a denial of     service ('kernel oops')

  - CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows     attackers to modify CPU state registers via a malformed     address.

  - CAN-2003-0364: The TCP/IP fragment reassembly handling     in the Linux kernel 2.4 allows remote attackers to cause     a denial of service (CPU consumption) via certain     packets that cause a large number of hash table     collisions

This advisory provides updated 2.2.20 kernel source, and binary kernel images for the i386 architecture. Other architectures and kernel versions will be covered by separate advisories.

A number of vulnerabilities have been found in the Linux 2.2 kernel that have been addressed with the latest 2.2.25 release.

A bug in the kernel module loader code could allow a local user to gain root privileges. This is done by a local user using ptrace and attaching to a modprobe process that is spawned if the user triggers the loading of a kernel module.

A temporary workaround can be used to defend against this flaw. It is possible to temporarily disable the kmod kernel module loading subsystem in the kernel after all of the required kernel modules have been loaded. Be sure that you do not need to load additional kernel modules after implementing this workaround. To use it, as root execute :

echo /no/such/file >/proc/sys/kernel/modprobe

To automate this, you may wish to add it as the last line of the /etc/rc.d/rc.local file. You can revert this change by replacing the content '/sbin/modprobe' in the /proc/sys/kernel/modprobe file. The root user can still manually load kernel modules with this workaround in place.

As well, multiple ethernet device drivers do not pad frames with null bytes, which could allow remote attackers to obtain information from previous packets or kernel memory by using malformed packets.

Finally, the 2.2 kernel allows local users to cause a crash of the host system by using the mmap() function with a PROT_READ parameter to access non-readable memory pages through the /proc/pid/mem interface.

All users are encouraged to upgrade to the latest kernel version provided.

For instructions on how to upgrade your kernel in Mandrake Linux, please refer to :

http://www.mandrakesecure.net/en/kernelupdate.php

ID	Name	Product	Family	Severity
15173	Debian DSA-336-1 : linux-kernel-2.2.20 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
14023	Mandrake Linux Security Advisory : kernel22 (MDKSA-2003:039)	Nessus	Mandriva Local Security Checks	high

Detections

Analytics

CVE-2002-1380

medium

Tenable Plugins

critical

high