CVE-2009-1895 Information

Description

The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID setting that does not clear the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags when executing a setuid or setgid program which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL pointer dereference attacks (2) bypass the mmap_min_addr protection mechanism or (3) defeat address space layout randomization (ASLR).

Reference

http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6 http://patchwork.kernel.org/patch/32598/ http://secunia.com/advisories/35801 http://secunia.com/advisories/36045 http://secunia.com/advisories/36051 http://secunia.com/advisories/36054 http://secunia.com/advisories/36116 http://secunia.com/advisories/36131 http://secunia.com/advisories/36759 http://secunia.com/advisories/37471 http://wiki.rpath.com/Advisories:rPSA-2009-0111 http://www.debian.org/security/2009/dsa-1844 http://www.debian.org/security/2009/dsa-1845 http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3 http://www.mandriva.com/security/advisories?name=MDVSA-2011:051 http://www.osvdb.org/55807 http://www.redhat.com/support/errata/RHSA-2009-1193.html http://www.redhat.com/support/errata/RHSA-2009-1438.html http://www.securityfocus.com/archive/1/505254/100/0/threaded http://www.securityfocus.com/archive/1/507985/100/0/threaded http://www.securityfocus.com/archive/1/512019/100/0/threaded http://www.securityfocus.com/bid/35647 http://www.ubuntu.com/usn/usn-807-1 http://www.vmware.com/security/advisories/VMSA-2009-0016.html http://www.vupen.com/english/advisories/2009/1866 http://www.vupen.com/english/advisories/2009/3316 https://bugs.launchpad.net/bugs/cve/2009-1895 https://oval.cisecurity.org/repository/search/definition/oval3Aorg.mitre.oval3Adef3A11768 https://oval.cisecurity.org/repository/search/definition/oval3Aorg.mitre.oval3Adef3A7826 https://oval.cisecurity.org/repository/search/definition/oval3Aorg.mitre.oval3Adef3A9453 https://rhn.redhat.com/errata/RHSA-2009-1540.html https://rhn.redhat.com/errata/RHSA-2009-1550.html https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html