QEMU fsdev/9p-iov-marshal.c v9fs_iov_vunmarshal Empty String null pointer dereference

CVSS Meta Temp Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in QEMU. The impacted element is the function v9fs_iov_vunmarshal of the file fsdev/9p-iov-marshal.c. Performing a manipulation as part of Empty String results in null pointer dereference. This vulnerability is cataloged as CVE-2016-8578. The attack must be initiated from a local position. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (version now known). It has been classified as problematic. This affects the function v9fs_iov_vunmarshal of the file fsdev/9p-iov-marshal.c. The manipulation as part of a Empty String leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

The v9fs_iov_vunmarshal function in fsdev/9p-iov-marshal.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (NULL pointer dereference and QEMU process crash) by sending an empty string parameter to a 9P operation.

The weakness was shared 11/04/2016 by Li Qiang with 360.cn Inc. (Website). The advisory is shared at openwall.com. This vulnerability is uniquely identified as CVE-2016-8578 since 10/10/2016. An attack has to be approached locally. Required for exploitation is a authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 95316 (SUSE SLES11 Security Update : kvm (SUSE-SU-2016:2902-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169412 (SUSE Enterprise Linux Security Update for qemu (SUSE-SU-2016:2988-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95316) and SecurityFocus (BID 93474†). The entries VDB-92455, VDB-93308, VDB-93310 and VDB-93312 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.0
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.0
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 95316
Nessus Name: SUSE SLES11 Security Update : kvm (SUSE-SU-2016:2902-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 65785
OpenVAS Name: SuSE Update for qemu openSUSE-SU-2016:3103-1 (qemu)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
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Timelineinfo

10/10/2016 🔍
10/10/2016 +0 days 🔍
11/04/2016 +25 days 🔍
11/04/2016 +0 days 🔍
11/07/2016 +3 days 🔍
11/24/2016 +17 days 🔍
11/25/2016 +1 days 🔍
09/29/2022 +2134 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: DLA 1599-1
Researcher: Li Qiang
Organization: 360.cn Inc.
Status: Not defined

CVE: CVE-2016-8578 (🔍)
GCVE (CVE): GCVE-0-2016-8578
GCVE (VulDB): GCVE-100-93309
SecurityFocus: 93474 - QEMU CVE-2016-8578 Null Pointer Dereference Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 11/07/2016 22:10
Updated: 09/29/2022 14:31
Changes: 11/07/2016 22:10 (65), 05/26/2019 16:20 (15), 09/29/2022 14:31 (3)
Complete: 🔍
Cache ID: 216:B6B:103

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