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GENTOO LINUX SECURITY ANNOUNCEMENT 200312-02
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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]


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