oss-sec mailing list archives
Re: CVE request: Qemu: scsi: pvscsi: out-of-bounds access issue in pvsci_ring_init_msg/data routines
From: cve-assign () mitre org
Date: Mon, 23 May 2016 13:33:03 -0400 (EDT)
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Quick Emulator(Qemu) built with the VMWARE PVSCSI paravirtual SCSI bus emulation support is vulnerable to an OOB r/w access issue. It could occur while processing SCSI commands 'PVSCSI_CMD_SETUP_RINGS' or 'PVSCSI_CMD_SETUP_MSG_RING'. A privileged user inside guest could use this flaw to crash the Qemu process resulting in DoS. https://lists.gnu.org/archive/html/qemu-devel/2016-05/msg03774.html
Vmware Paravirtual SCSI emulation uses command descriptors to process SCSI commands. These descriptors come with their ring buffers. A guest could set the ring buffer size to an arbitrary value leading to OOB access issue. Add check to avoid it.
Use CVE-2016-4952. This is not yet available at http://git.qemu.org/?p=qemu.git;a=history;f=hw/scsi/vmw_pvscsi.c but that may be an expected place for a later update. - -- CVE Assignment Team M/S M300, 202 Burlington Road, Bedford, MA 01730 USA [ A PGP key is available for encrypted communications at http://cve.mitre.org/cve/request_id.html ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCAAGBQJXQz5SAAoJEHb/MwWLVhi2csUP/0e0mBl7EgwbVigNAvU8UUWD MoA509vJm8qAw34v8A7tOnmDxOM89aW7z5RDPEWScw+mjHJEf39bW5Ibrvn56Gy/ IvHcS9At+stv00zqSdhAFD3sCVUqLvU3ybt+3+gu5m/4teCc+llO/72T+xLYIiwE H8lQnZdxuSRIXeyU4gbAIlPDLLqguTjNVuma1Cu+G6S5ka4h7EUJpPz2UyJotOw/ T9B8jklo0aR3odLiYuZ97I49yky2jAqWznYUAIasriKbG0ahdBvSjEy4aa93FLSM eWffJVwgxX5YFNMjr0M8AnMP5/1VQZFQz4mbLpAE7rb4/sry2wb7t7/6gBTFnfvD xEruol3jgBqtIsAqfldkP2u9hPWVzJO+yIpqpUkGUWg2b00jadLIb4CJcSWSeVbo h9YH3IgX7yCwAorT4YoQ6PEtrgiXHjief1208tVKa25gwyHERLuc1VSmsAimXedI qdFlK7onHAgKMNoymiGtcuSWUQc06F/SJXcSCUFO3UBnS2Yki65WjS6hdWlaaLyJ hPowD8PJDZv47h+slMPAjKUUEVHNB5e0Pbsk+ig7LMbq4k8tQsHzWH32oXznwRvL pk6TmROU3CVQsBmdhfsMSR9pvg6GQQAA7BCoEt9jLjxS76n09JWblQP28qeZSZQ0 oshueEI3i19JNzNIIbc8 =KEBo -----END PGP SIGNATURE-----
Current thread:
- CVE request: Qemu: scsi: pvscsi: out-of-bounds access issue in pvsci_ring_init_msg/data routines P J P (May 23)
- Re: CVE request: Qemu: scsi: pvscsi: out-of-bounds access issue in pvsci_ring_init_msg/data routines cve-assign (May 23)