Explain CVE-2009-1895
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).
Affected Products: n/a
References: [{'name': '20100625 VMSA-2010-0010 ESX 3.5 third party update for Service Console kernel', 'tags': ['mailing-list', 'x_refsource_BUGTRAQ'], 'url': 'http://www.securityfocus.com/archive/1/512019/100/0/threaded'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://wiki.rpath.com/Advisories:rPSA-2009-0111'}, {'name': '36131', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36131'}, {'name': '55807', 'tags': ['vdb-entry', 'x_refsource_OSVDB'], 'url': 'http://www.osvdb.org/55807'}, {'name': 'ADV-2009-1866', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/1866'}, {'name': 'RHSA-2009:1540', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://rhn.redhat.com/errata/RHSA-2009-1540.html'}, {'name': '37471', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/37471'}, {'name': '36759', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36759'}, {'name': 'FEDORA-2009-8144', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html'}, {'name': 'DSA-1844', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'http://www.debian.org/security/2009/dsa-1844'}, {'name': 'USN-807-1', 'tags': ['vendor-advisory', 'x_refsource_UBUNTU'], 'url': 'http://www.ubuntu.com/usn/usn-807-1'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.vmware.com/security/advisories/VMSA-2009-0016.html'}, {'name': 'RHSA-2009:1193', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'http://www.redhat.com/support/errata/RHSA-2009-1193.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6'}, {'name': 'oval:org.mitre.oval:def:7826', 'tags': ['vdb-entry', 'signature', 'x_refsource_OVAL'], 'url': 'https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826'}, {'name': '35647', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/35647'}, {'name': 'FEDORA-2009-8264', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html'}, {'name': '20090724 rPSA-2009-0111-1 kernel', 'tags': ['mailing-list', 'x_refsource_BUGTRAQ'], 'url': 'http://www.securityfocus.com/archive/1/505254/100/0/threaded'}, {'tags': ['x_refsource_MISC'], 'url': 'http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.html'}, {'name': 'MDVSA-2011:051', 'tags': ['vendor-advisory', 'x_refsource_MANDRIVA'], 'url': 'http://www.mandriva.com/security/advisories?name=MDVSA-2011:051'}, {'name': '20091120 VMSA-2009-0016 VMware vCenter and ESX update release and vMA patch release address multiple security issue in third party components', 'tags': ['mailing-list', 'x_refsource_BUGTRAQ'], 'url': 'http://www.securityfocus.com/archive/1/507985/100/0/threaded'}, {'name': '36051', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36051'}, {'name': 'oval:org.mitre.oval:def:11768', 'tags': ['vdb-entry', 'signature', 'x_refsource_OVAL'], 'url': 'https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768'}, {'name': '36045', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36045'}, {'name': '36116', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36116'}, {'name': 'RHSA-2009:1550', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'https://rhn.redhat.com/errata/RHSA-2009-1550.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://patchwork.kernel.org/patch/32598/'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3'}, {'name': '35801', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/35801'}, {'name': '36054', 'tags': ['third-party-advisory', 'x_refsource_SECUNIA'], 'url': 'http://secunia.com/advisories/36054'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://bugs.launchpad.net/bugs/cve/2009-1895'}, {'name': 'DSA-1845', 'tags': ['vendor-advisory', 'x_refsource_DEBIAN'], 'url': 'http://www.debian.org/security/2009/dsa-1845'}, {'name': 'oval:org.mitre.oval:def:9453', 'tags': ['vdb-entry', 'signature', 'x_refsource_OVAL'], 'url': 'https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453'}, {'name': 'RHSA-2009:1438', 'tags': ['vendor-advisory', 'x_refsource_REDHAT'], 'url': 'http://www.redhat.com/support/errata/RHSA-2009-1438.html'}, {'name': 'ADV-2009-3316', 'tags': ['vdb-entry', 'x_refsource_VUPEN'], 'url': 'http://www.vupen.com/english/advisories/2009/3316'}]
CVE State: PUBLISHED