oss-sec mailing list archives
Re: CVE request Qemu net: rocker: fix an incorrect array bounds check
From: cve-assign () mitre org
Date: Tue, 29 Dec 2015 01:33:52 -0500 (EST)
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Qemu emulator built with the Rocker switch emulation support is vulnerable to an off-by-one error. It happens while processing transmit(tx) descriptors in 'tx_consume' routine, if a descriptor was to have more than allowed (ROCKER_TX_FRAGS_MAX=16) fragments. A privileged user inside guest could use this flaw to cause memory leakage on the host or crash the Qemu process instance resulting in DoS issue. https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg04629.html https://bugzilla.redhat.com/show_bug.cgi?id=1286971
While processing transmit(tx) descriptors in 'tx_consume' routine the switch emulator suffers from an off-by-one error, if a descriptor was to have more than allowed(ROCKER_TX_FRAGS_MAX=16) fragments. Fix an incorrect bounds check to avoid it.
Use CVE-2015-8701. This is not yet available at http://git.qemu.org/?p=qemu.git;a=history;f=hw/net/rocker/rocker.c but that may be an expected place for a later update. - -- CVE assignment team, MITRE CVE Numbering Authority M/S M300 202 Burlington Road, Bedford, MA 01730 USA [ PGP key available through http://cve.mitre.org/cve/request_id.html ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCAAGBQJWgiicAAoJEL54rhJi8gl5xgMP/0m/6rggx4QjsM1bvTzJxs6T VyoOVeWKJVqO2qMtl0eHwhsQZty8O26Qbyewqvt13551IjbYxbvHLZzo/wwN1b16 oiQjdsjSZyR+Uw3GYLmmEf2Np1EvRsvAO+wqOzhJ1I/ktbrP1V1Z7Zi6pt2HHDmq jQaPvHv4jjd00bvmO6zWvrAPQZlwK5IWhQsB3QM9zZOBik95q9N2VstM6lLzMu2U VlGa0CHW7VUtOiN8Bw+iBFXyv8ZAgrOrtMbgIwt6EjlYefuNOrVFhp9EEvNONegW mOaj6Xucm44gVGO0NkHcH6XILFwdESs7T57pvqLlDbCOhVSZpX/Xq9PO+ZqiI3AD 7EpbV6tye2GodfvLtxOu0WKaHAbZRKK9ynWo3zVCOcsHDmS864w4eZZexj+fGgsg dpY3c9j+otN1J+bgRaNGvKapQ0LrJAffXMk5iTb4233KF0/SSnmAMbU46lI/Sn7d E6PGoHkosmPPQvjaNLf3BOetzKSO7cQj9CJ1Uen2RsuTHlJ3FoyAdUs5nk33Z96z wiiHTl7duEtslr3mHq6xwynbgfDyPvlnrchMS8Q8NBUf2fUnKiDK6zdsiH3s14dh QA8F6eDCEIxqGyKM0UMAYiUTcejx0NtZ5TFSTR5LCx+CmSbtm2wJhBiGOz4r797b iCXQR5QRr2Ml8Zq6nk8/ =idCx -----END PGP SIGNATURE-----
Current thread:
- CVE request Qemu net: rocker: fix an incorrect array bounds check P J P (Dec 28)
- Re: CVE request Qemu net: rocker: fix an incorrect array bounds check cve-assign (Dec 28)