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Conectiva Linux Advisory: kernel

Apr 07, 2003, 17:23 (0 Talkback[s])

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PACKAGE   : kernel
SUMMARY   : Local vulnerability: ptrace
DATE      : 2003-04-07 11:07:00
ID        : CLA-2003:618
RELEASES  : 6.0, 7.0, 8

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 The Linux kernel is responsible for handling the basic functions of
 the GNU/Linux operating system. 
 Alan Cox published[4] a vulnerability[1] in the linux kernel found by
 Andrzej Szombierski that could be used by a local attacker to obtain
 root privileges.
 When a process requires a feature that a certain kernel module
 provides,  the kernel will spawn a child process, give it root
 privileges and call /sbin/modprobe to load that module. A local
 attacker can create such a process, make it request a kernel module
 and wait for the child process to be spawned. Before the privilege
 change, the attacker can attach to this child process and insert code
 that will later be run with root privileges.
 The Common Vulnerabilities and Exposures project has assigned the
 name CAN-2003-0127[1] to this issue.

 It is recommended that all users upgrade their kernel packages.
 Please note that Conectiva Linux 7.0 has two options for the kernel
 upgrade, the 2.2 series and the 2.4 series.
 IMPORTANT: it is not possible to use apt to apply kernel updates.
 These packages have to be updated manually. Generic kernel update
 instructions can be found in our updates page[2].


 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
Instructions on how to check the signatures of the RPM packages can be
found at

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All our advisories and generic update instructions can be viewed at

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Copyright 2003 (c) Conectiva Inc.