CVE-2013-1796: Buffer Overflow
First published: Fri Mar 01 2013(Updated: )
Description of the problem: If the guest sets the GPA of the time_page so that the request to update the time straddles a page then KVM will write onto an incorrect page. The write is done byusing kmap atomic to get a pointer to the page for the time structure and then performing a memcpy to that page starting at an offset that the guest controls. Well behaved guests always provide a 32-byte aligned address, however a malicious guest could use this to corrupt host kernel memory. Acknowledgements: Red Hat would like to thank Andrew Honig of Google for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=3.8.4 | |
| Linux Kernel | =3.8.0 | |
| Linux Kernel | =3.8.1 | |
| Linux Kernel | =3.8.2 | |
| Linux Kernel | =3.8.3 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.17-1 |
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Reference Links
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=c300aa64ddf57d9c5d9c898a64b36877345dd4a9
- http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00018.html
- http://rhn.redhat.com/errata/RHSA-2013-0727.html
- http://rhn.redhat.com/errata/RHSA-2013-0744.html
- http://rhn.redhat.com/errata/RHSA-2013-0746.html
- http://rhn.redhat.com/errata/RHSA-2013-0928.html
- http://rhn.redhat.com/errata/RHSA-2013-1026.html
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
- http://www.openwall.com/lists/oss-security/2013/03/20/9
- http://www.securityfocus.com/bid/58607
- http://www.ubuntu.com/usn/USN-1805-1
- http://www.ubuntu.com/usn/USN-1808-1
- http://www.ubuntu.com/usn/USN-1809-1
- http://www.ubuntu.com/usn/USN-1812-1
- http://www.ubuntu.com/usn/USN-1813-1
- https://bugzilla.redhat.com/show_bug.cgi?id=917012
- https://github.com/torvalds/linux/commit/c300aa64ddf57d9c5d9c898a64b36877345dd4a9
- https://launchpad.net/bugs/cve/CVE-2013-1796
- https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=c300aa64ddf57d9c5d9c898a64b36877345dd4a9
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=923966
- https://rhn.redhat.com/errata/RHSA-2013-0727.html
- https://rhn.redhat.com/errata/RHSA-2013-0744.html
- https://rhn.redhat.com/errata/RHSA-2013-0746.html
- https://rhn.redhat.com/errata/RHSA-2013-0928.html
- https://rhn.redhat.com/errata/RHSA-2013-1026.html
- https://www.openwall.com/lists/oss-security/2013/03/20/9
- https://security-tracker.debian.org/tracker/CVE-2013-1796
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-1796
- https://nvd.nist.gov/vuln/detail/CVE-2013-1796
- https://ubuntu.com/security/CVE-2013-1796
Frequently Asked Questions
What is the severity of CVE-2013-1796?
CVE-2013-1796 is considered a moderate severity vulnerability that affects data integrity in the Linux kernel.
How can I fix CVE-2013-1796?
To fix CVE-2013-1796, upgrade to a patched version of the Linux kernel such as 5.10.223-1, 5.10.226-1, or any version later than 3.8.4.
Which versions of the Linux kernel are affected by CVE-2013-1796?
CVE-2013-1796 affects Linux kernel versions up to and including 3.8.4 and specific earlier versions such as 3.8.0 to 3.8.3.
What type of vulnerability is CVE-2013-1796?
CVE-2013-1796 is a memory handling vulnerability that can lead to incorrect memory writes in the Linux kernel.
Is CVE-2013-1796 exploitable in a virtualized environment?
Yes, CVE-2013-1796 is exploitable in virtualized environments that utilize KVM.
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