7.8
CWE
20
Advisory Published
CVE Published
Updated

CVE-2013-1943: Input Validation

First published: Wed Apr 10 2013(Updated: )

A check for valid userspace memory was found missing in kvm_set_memory_region() function. Because of that, memory regions pointing to kernel memory could be registered with KVM and later used when converting guest physical addresses to host virtual ones. Several call sites relied on the validation and were using read/write functions that were missing the access_ok() check when accessing userspace memory. A local unprivileged user on Red Hat Enterprise Linux 6 system could use this flaw to escalate their privileges on the system. On Red Hat Enterprise Linux 6.2 EUS and Red Hat Enterprise Linux 6.3 EUS the impact is limited to potential information leak only. A local user on Red Hat Enterprise Linux 5 system able to write to /dev/kvm could possibly use this flaw to leak kernel memory. Upstream fixes: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fa3d315a4ce2c0891cdde262562e710d95fba19e">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fa3d315a4ce2c0891cdde262562e710d95fba19e</a> <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9e3bb6b6f6a0c535eb053fbf0005a8e79e053374">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9e3bb6b6f6a0c535eb053fbf0005a8e79e053374</a> Acknowledgements: This issue was discovered by Michael S. Tsirkin of Red Hat.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<3.0
Redhat Enterprise Linux=5.0
Redhat Enterprise Linux Eus=6.2
Redhat Enterprise Linux Eus=6.3
Canonical Ubuntu Linux=10.04
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.12.5-1
6.12.6-1

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203