QEMU Symbolic Link link following

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

A vulnerability classified as critical was found in QEMU (Virtualization Software) (affected version not known). Affected by this vulnerability is some unknown functionality of the component Symbolic Link Handler. The manipulation with an unknown input leads to a link following vulnerability. The CWE definition for the vulnerability is CWE-59. The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Qemu before version 2.9 is vulnerable to an improper link following when built with the VirtFS. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.

The bug was discovered 01/17/2017. The weakness was published 01/17/2017 by Jann Horn with Google Project Zero as Bug 1413929 as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. This vulnerability is known as CVE-2016-9602 since 11/23/2016. An attack has to be approached locally. A single authentication is required for exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 100514 (Debian DLA-965-1 : qemu-kvm security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196757 (Ubuntu Security Notification for Qemu Vulnerabilities (USN-3261-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 5 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (100514). Similar entries are available at 9597, 97321, 101444 and 120911.

Productinfo

Type

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 7.6
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Link following
CWE: CWE-59
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 100514
Nessus Name: Debian DLA-965-1 : qemu-kvm security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 850584
OpenVAS Name: SuSE Update for qemu openSUSE-SU-2017:1872-1 (qemu)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

11/23/2016 🔍
01/17/2017 +55 days 🔍
01/17/2017 +0 days 🔍
01/17/2017 +0 days 🔍
01/17/2017 +0 days 🔍
01/17/2017 +0 days 🔍
01/19/2017 +2 days 🔍
05/31/2017 +132 days 🔍
05/31/2017 +0 days 🔍
04/26/2018 +329 days 🔍
11/01/2022 +1650 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: Bug 1413929
Researcher: Jann Horn
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-9602 (🔍)
SecurityTracker: 1037604
SecurityFocus: 95461 - QEMU CVE-2016-9602 Privilege Escalation Vulnerability
OSVDB: - CVE-2016-9602 - QEMU - Privilege Escalation Issue

See also: 🔍

Entryinfo

Created: 01/19/2017 12:02
Updated: 11/01/2022 15:03
Changes: 01/19/2017 12:02 (79), 07/25/2020 07:42 (9), 11/01/2022 15:03 (13)
Complete: 🔍

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