QEMU Rocker Switch Emulation tx_consume numeric error

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability has been found in QEMU and classified as problematic. This vulnerability affects the function tx_consume of the component Rocker Switch Emulation. Performing a manipulation results in numeric error. This vulnerability was named CVE-2015-8701. The attack needs to be approached locally. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (the affected version unknown). It has been classified as problematic. This affects the function tx_consume of the component Rocker Switch Emulation. The manipulation with an unknown input leads to a numeric error vulnerability. CWE is classifying the issue as CWE-189. This is going to have an impact on availability. The summary by CVE is:

QEMU (aka Quick 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.

The bug was discovered 12/29/2015. The weakness was presented 12/29/2016 by Qinghao Tang with Qihoo 360 (Website). The advisory is shared at openwall.com. This vulnerability is uniquely identified as CVE-2015-8701 since 12/29/2015. An attack has to be approached locally. A authentication is necessary for exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 25 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 89526 (Fedora 23 : qemu-2.4.1-6.fc23 (2016-42778e8c82)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 124605 (Fedora Security Update for qemu (FEDORA-2016-42778e8c82)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (89526) and SecurityFocus (BID 79706†). See VDB-94716, VDB-94715 and VDB-94714 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.8
VulDB Temp Score: 3.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Numeric error
CWE: CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 89526
Nessus Name: Fedora 23 : qemu-2.4.1-6.fc23 (2016-42778e8c82)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802238
OpenVAS Name: Fedora Update for qemu FEDORA-2016-42778
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/29/2015 🔍
12/29/2015 +0 days 🔍
12/29/2015 +0 days 🔍
01/23/2016 +25 days 🔍
03/04/2016 +41 days 🔍
12/29/2016 +300 days 🔍
12/29/2016 +0 days 🔍
12/30/2016 +1 days 🔍
10/12/2022 +2112 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: FEDORA-2016-42778e8c82
Researcher: Qinghao Tang
Organization: Qihoo 360
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-8701 (🔍)
GCVE (CVE): GCVE-0-2015-8701
GCVE (VulDB): GCVE-100-94713
SecurityFocus: 79706 - QEMU 'rocker.c' Stack Buffer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 12/30/2016 10:28
Updated: 10/12/2022 22:25
Changes: 12/30/2016 10:28 (68), 07/21/2019 18:53 (12), 10/12/2022 22:25 (3)
Complete: 🔍
Cache ID: 216:11F:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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