GENTOO LINUX SECURITY ANNOUNCEMENT 200312-02
| GLSA: | 200312-02 |
| package: | kernel |
| summary: | A flaw in the do_brk() function of Linux kernel 2.4.22 and earlier can be exploited by local users or malicious services to gain root privileges. |
| severity: | high |
| Gentoo bug: | 34844 |
| date: | 2003-12-04 |
| CVE: | CAN-2003-0961 |
| exploit: | local |
| affected: | <2.4.22 |
| fixed: | >=2.4.23 |
| fixed: | >=2.4.22+patches |
DESCRIPTION:
Lack of proper bounds checking exists in the do_brk() kernel
function in Linux kernels prior to 2.4.23. This bug can be used to
give a userland program or malicious service access to the full
kernel address space and gain root privileges. This issue is known
to be exploitable.
All kernel ebuilds in Portage have been bumped or patched and do
not contain this vulnerability. The following is a list of
recommended kernels.
aa-sources-2.4.23_pre6-r3
ck-sources-2.4.22-r3
gentoo-sources-2.4.20-r9
gentoo-sources-2.4.22-r1
grsec-sources-2.4.22.1.9.12-r1
grsec-sources-2.4.22.2.0_rc3-r1
gs-sources-2.4.23_pre8-r1
hardened-sources-2.4.22-r1
hardened-sources-2.4.22-r1
ia64-sources-2.4.22-r1
mips-sources-2.4.22-r4
mips-sources-2.4.22-r5
openmosix-sources-2.4.22-r1
ppc-sources-2.4.22-r3
ppc-sources-benh-2.4.20-r9
ppc-sources-benh-2.4.21-r2
ppc-sources-benh-2.4.22-r3
ppc-sources-crypto-2.4.20-r1
selinux-sources-2.4.21-r5
sparc-sources-2.4.23
usermode-sources-2.4.22-r1
wolk-sources-4.10_pre7-r1
wolk-sources-4.9-r2
xfs-sources-2.4.20-r4
SOLUTION:
It is recommended that all Gentoo Linux users upgrade their
machines to use a kernel from the list above.
emerge sync
emerge -pv [your preferred kernel sources]
emerge [your preferred kernel sources]
[update the /usr/src/linux symlink]
[compile and install your new kernel]
[emerge any necessary kernel module ebuilds]
[reboot]
// end
—
GENTOO LINUX SECURITY ANNOUNCEMENT 200312-03
—
| GLSA: | 200312-03 |
| summary: | exploitable heap overflow in rsync |
| severity: | high |
| date: | 2003-12-04 |
| exploit: | remote |
| affected: | <2.5.6* |
| fixed: | >2.5.7 |
DESCRIPTION:
Rsync version 2.5.6 contains a vulnerability that can be used to
run arbitrary code. The Gentoo infrastructure team has some
reasonably good forensic evidence that this exploit may have been
used in combination with the Linux kernel brk vulnerability (see
GLSA 200312-02) to exploit a rsync.gentoo.org rotation server (see
GLSA-200312-01.)
Please see http://lwn.net/Articles/61541/
for the security advisory release by the rsync development
team.
SOLUTION:
To address this vulnerability, all Gentoo users should:
Read GLSA-200312-02 and ensure that all systems are upgraded to
a version of the Linux kernel without the brk vulnerability
Upgrade to version 2.5.7 of rsync. This can be done by
typing:
emerge sync;
emerge >net-misc/rsync-2.5.7
Review your /etc/rsyncd.conf configuration file; ensure that the
use chroot “no” command is commented out or removed, or change use
chroot “no” to use chroot “yes”. Then, if necessary, restart rsyncd
by typing:
/etc/init.d/rsyncd restart
//end