Description

The vdso_addr function in arch/x86/vdso/vma.c in the Linux kernel through 3.18.2 does not properly choose memory locations for the vDSO area, which makes it easier for local users to bypass the ASLR protection mechanism by guessing a location at the end of a PMD.

References

http://git.kernel.org/?p=linux/kernel/git/luto/linux.git;a=commit;h=bc3b94c31d65e761ddfe150d02932c65971b74e2

http://git.kernel.org/?p=linux/kernel/git/tip/tip.git;a=commit;h=fbe1bf140671619508dfa575d74a185ae53c5dbb

http://lists.fedoraproject.org/pipermail/package-announce/2015-January/148480.html

http://lists.opensuse.org/opensuse-security-announce/2015-01/msg00035.html

http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00010.html

http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00025.html

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00000.html

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00009.html

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html

http://rhn.redhat.com/errata/RHSA-2015-1081.html

http://rhn.redhat.com/errata/RHSA-2015-1778.html

http://rhn.redhat.com/errata/RHSA-2015-1787.html

http://v0ids3curity.blogspot.in/2014/12/return-to-vdso-using-elf-auxiliary.html

http://www.debian.org/security/2015/dsa-3170

http://www.mandriva.com/security/advisories?name=MDVSA-2015:058

http://www.openwall.com/lists/oss-security/2014/12/09/10

http://www.openwall.com/lists/oss-security/2015/01/09/8

http://www.securityfocus.com/bid/71990

http://www.ubuntu.com/usn/USN-2513-1

http://www.ubuntu.com/usn/USN-2514-1

http://www.ubuntu.com/usn/USN-2515-1

http://www.ubuntu.com/usn/USN-2516-1

http://www.ubuntu.com/usn/USN-2517-1

http://www.ubuntu.com/usn/USN-2518-1

Details

Risk Information

CVSS v2