QEMU VirtFS access control

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in QEMU. This affects an unknown part of the component VirtFS. Such manipulation leads to access control. This vulnerability is traded as CVE-2017-7493. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (version unknown) and classified as critical. Affected by this issue is an unknown function of the component VirtFS. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System(9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing virtfs metadata files in mapped-file security mode. A guest user could use this flaw to escalate their privileges inside guest.

The bug was discovered 05/17/2017. The weakness was shared 05/17/2017 as not defined mailinglist post (oss-sec). The advisory is shared for download at seclists.org. This vulnerability is handled as CVE-2017-7493 since 04/05/2017. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

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 170142 (SUSE Enterprise Linux Security Update for qemu (SUSE-SU-2017:1774-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100514) and SecurityFocus (BID 98574†). The entries VDB-9597, VDB-95545, VDB-98316 and VDB-99556 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

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

04/05/2017 🔍
05/17/2017 +42 days 🔍
05/17/2017 +0 days 🔍
05/17/2017 +0 days 🔍
05/17/2017 +0 days 🔍
05/18/2017 +1 days 🔍
05/31/2017 +13 days 🔍
05/31/2017 +0 days 🔍
12/06/2022 +2015 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: DLA 1497-1
Researcher: Leo Gaspard.
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7493 (🔍)
GCVE (CVE): GCVE-0-2017-7493
GCVE (VulDB): GCVE-100-101444
SecurityFocus: 98574 - QEMU 'hw/9pfs/9p-local.c' Privilege Escalation Vulnerability
OSVDB: - CVE-2017-7493 - QEMU - Privilege Escalation Issue

See also: 🔍

Entryinfo

Created: 05/18/2017 16:20
Updated: 12/06/2022 14:32
Changes: 05/18/2017 16:20 (74), 09/30/2020 08:03 (6), 12/24/2020 15:53 (2), 12/06/2022 14:32 (3)
Complete: 🔍
Cache ID: 216::103

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