Bug 1286971 (CVE-2015-8701) - CVE-2015-8701 Qemu: net: rocker: stack buffer overflow(off-by-one) in tx_consume routine
Summary: CVE-2015-8701 Qemu: net: rocker: stack buffer overflow(off-by-one) in tx_cons...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-8701
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1293720
Blocks: 1286975
TreeView+ depends on / blocked
 
Reported: 2015-12-01 09:27 UTC by Adam Mariš
Modified: 2021-06-01 15:24 UTC (History)
26 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An off-by-one vulnerability was discovered in the QEMU emulator built with Rocker-switch emulation support. The flaw occurred when processing transmit(tx) descriptors in the 'tx_consume' routine, if a descriptor had more than the allowed fragments (ROCKER_TX_FRAGS_MAX=16).
Clone Of:
Environment:
Last Closed: 2019-06-08 02:45:58 UTC
Embargoed:

Attachments (Terms of Use)

Description Adam Mariš 2015-12-01 09:27:41 UTC 
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.

Upstream patch:
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  -> https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg04629.html

Reference:
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  -> http://www.openwall.com/lists/oss-security/2015/12/29/1
Comment 2 Prasad Pandit 2015-12-22 19:37:11 UTC 
Statement: 

This issue does not affect the versions of the kvm and xen packages as shipped with Red Hat Enterprise Linux 5.

This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 6, and the Red Hat Enterprise Linux 6 based versions of qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.

This issue does not affect the versions of the qemu-kvm packages as shipped with Red Hat Enterprise Linux 7.

This issue does not affect the Red Hat Enterprise Linux 7 based versions of the qemu-kvm-rhev packages as shipped with Red Hat Enterprise Virtualization 3.
Comment 3 Prasad Pandit 2015-12-22 20:26:14 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1293720]
Comment 4 Fedora Update System 2016-01-24 03:26:42 UTC 
qemu-2.4.1-6.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
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