CVE-2009-1895: Null Pointer Dereference
First published: Thu Jul 16 2009(Updated: )
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).
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <=2.6.31 | |
| Linux kernel | =2.6.31-rc1 | |
| Linux kernel | =2.6.31-rc2 | |
| Debian | =5.0 | |
| Debian | =4.0 | |
| Ubuntu Linux | =6.06 | |
| Ubuntu Linux | =9.04 | |
| Ubuntu Linux | =8.04 | |
| Ubuntu Linux | =8.10 | |
| Linux Kernel | <=2.6.31 | |
| Linux Kernel | =2.6.31-rc1 | |
| Linux Kernel | =2.6.31-rc2 | |
| Ubuntu | =6.06 | |
| Ubuntu | =8.04 | |
| Ubuntu | =8.10 | |
| Ubuntu | =9.04 |
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Reference Links
- http://blog.cr0.org/2009/06/bypassing-linux-null-pointer.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://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://www.osvdb.org/55807
- http://www.vupen.com/english/advisories/2009/1866
- http://www.vupen.com/english/advisories/2009/3316
- http://www.debian.org/security/2009/dsa-1844
- http://www.debian.org/security/2009/dsa-1845
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00223.html
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg00166.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
- http://www.redhat.com/support/errata/RHSA-2009-1193.html
- http://www.redhat.com/support/errata/RHSA-2009-1438.html
- https://rhn.redhat.com/errata/RHSA-2009-1540.html
- https://rhn.redhat.com/errata/RHSA-2009-1550.html
- http://www.ubuntu.com/usn/usn-807-1
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
- http://patchwork.kernel.org/patch/32598/
- http://wiki.rpath.com/Advisories:rPSA-2009-0111
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc3
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html
- https://bugs.launchpad.net/bugs/cve/2009-1895
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11768
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7826
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9453
Frequently Asked Questions
What is the severity of CVE-2009-1895?
CVE-2009-1895 is classified as a moderate severity vulnerability.
How do I fix CVE-2009-1895?
To fix CVE-2009-1895, update the Linux kernel to version 2.6.31 or newer.
Which systems are affected by CVE-2009-1895?
CVE-2009-1895 affects Linux kernel versions prior to 2.6.31, as well as specific versions of Debian and Ubuntu.
What type of vulnerability is CVE-2009-1895?
CVE-2009-1895 is a local privilege escalation vulnerability in the Linux kernel's personality subsystem.
What happens if CVE-2009-1895 is exploited?
Exploitation of CVE-2009-1895 can allow local users to gain elevated privileges.
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