GLSA-200408-24 : Linux Kernel: Multiple information leaks

This script is Copyright (C) 2004-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200408-24
(Linux Kernel: Multiple information leaks)

The Linux kernel allows a local attacker to obtain sensitive kernel
information by gaining access to kernel memory via several leaks in the
/proc interfaces. These vulnerabilities exist in various drivers which
make up a working Linux kernel, some of which are present across all
architectures and configurations.
CAN-2004-0415 deals with addressing invalid 32 to 64 bit conversions in
the kernel, as well as insecure direct access to file offset pointers
in kernel code which can be modified by the open(...), lseek(...) and
other core system I/O functions by an attacker.
CAN-2004-0685 deals with certain USB drivers using uninitialized
structures and then using the copy_to_user(...) kernel call to copy
these structures. This may leak uninitialized kernel memory, which can
contain sensitive information from user applications.
Finally, a race condition with the /proc/.../cmdline node was found,
allowing environment variables to be read while the process was still
spawning. If the race is won, environment variables of the process,
which might not be owned by the attacker, can be read.

Impact :

These vulnerabilities allow a local unprivileged attacker to access
segments of kernel memory or environment variables which may contain
sensitive information. Kernel memory may contain passwords, data
transferred between processes and any memory which applications did not
clear upon exiting as well as the kernel cache and kernel buffers.
This information may be used to read sensitive data, open other attack
vectors for further exploitation or cause a Denial of Service if the
attacker can gain superuser access via the leaked information.

Workaround :

There is no temporary workaround for any of these information leaks
other than totally disabling /proc support - otherwise, a kernel
upgrade is required. A list of unaffected kernels is provided along
with this announcement.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200408-24.xml

Solution :

Users are encouraged to upgrade to the latest available sources for
their system:
# emerge sync
# emerge -pv your-favorite-sources
# emerge your-favorite-sources
# # Follow usual procedure for compiling and installing a kernel.
# # If you use genkernel, run genkernel as you would normally.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 14580 (gentoo_GLSA-200408-24.nasl)

Bugtraq ID:

CVE ID: CVE-2004-0415
CVE-2004-0685
CVE-2004-1058