kernel security update

Updated kernel packages that fix several security issues in Red Hat
Enterprise Linux 2.1 are now available.

The Linux kernel handles the basic functions of the operating system.

This advisory includes fixes for the following security issues:

iSEC Security Research discovered a VMA handling flaw in the uselib(2)
system call of the Linux kernel. A local user could make use of this
flaw to gain elevated (root) privileges. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2004-1235 to
this issue.

iSEC Security Research discovered a flaw in the page fault handler code
that could lead to local users gaining elevated (root) privileges on
multiprocessor machines. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2005-0001 to this issue.

A flaw was discovered where an executable could cause a VMA overlap leading
to a crash. On Itanium systems, a local user could trigger this flaw by
creating a carefully crafted ELF binary. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2005-0003 to
this issue.

iSEC Security Research and Georgi Guninski independently discovered a flaw
in the scm_send function in the auxiliary message layer. A local user
could create a carefully crafted auxiliary message which could cause a
denial of service (system hang). The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2004-1016 to this issue.

Kirill Korotaev found a flaw in load_elf_binary affecting kernels prior to
2.4.26. A local user could create a carefully crafted binary in such a
way that it would cause a denial of service (system crash). The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the
name CAN-2004-1234 to this issue.

These packages also fix issues in the io_edgeport driver (CAN-2004-1017), a
memory leak in ip_options_get (CAN-2004-1335), and missing VM_IO
flags in some drivers (CAN-2004-1057).

Olaf Kirch discovered that the recent security fixes for cmsg_len handling
(CAN-2004-1016) broke 32-bit compatibility on 64-bit platforms. A patch to
correct this issue is included.

A recent Internet Draft by Fernando Gont recommended that ICMP Source
Quench messages be ignored by hosts. A patch to ignore these messages is
included.

All Red Hat Enterprise Linux 2.1 users running Itanium are advised to
upgrade their kernels to the packages listed in this erratum.

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

137822 - CAN-2004-1057 VM_IO refcount issue
142596 - CAN-2004-1017 io_edgeport driver overflows
142731 - CAN-2004-1016 CMSG validation checks (ipf)
142735 - CAN-2004-1335 ip_options_get memory leak (ipf)
143379 - CAN-2004-1234 kernel denial of service vulnerability and exploit (ipf)
144108 - LTC13271- Regression: Fix for E7 can cause sendmsg() to fail
144138 - CAN-2004-1235 isec.pl do_brk() privilege escalation
144408 - CAN-2005-0001 page fault @ SMP privilege escalation
144785 - CAN-2005-0003 huge vma-in-executable bug

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0791
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1016
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1017
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1057
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1234
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1235
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-1335
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0001
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-0003
http://marc.theaimsgroup.com/?m=109503896031720
http://www.isec.pl/vulnerabilities/isec-0019-scm.txt
http://www.isec.pl/vulnerabilities/isec-0021-uselib.txt
http://www.isec.pl/vulnerabilities/isec-0022-pagefault.txt

errata, kernel, security,