QEMU VirtFS 9pfs_list_xattr access control

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

Summaryinfo

A vulnerability was found in QEMU. It has been rated as critical. Affected is the function 9pfs_list_xattr of the component VirtFS. The manipulation leads to access control. This vulnerability is documented as CVE-2017-7471. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (version unknown) and classified as critical. This issue affects the function 9pfs_list_xattr 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. The summary by CVE is:

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 files on a shared host directory. 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 07/18/2018. The weakness was released 07/09/2018 by Prasad J Pandit (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2017-7471 since 04/05/2017. The exploitation is known to be easy. The attack may be initiated remotely. The successful exploitation requires a simple authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

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 even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100514) and SecurityFocus (BID 97970†). Entries connected to this vulnerability are available at VDB-9597, VDB-95545, VDB-98316 and VDB-99556. Be aware that VulDB is the high quality 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: 7.6
VulDB Meta Temp Score: 7.5

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

NVD Base Score: 9.0
NVD Vector: 🔍

CVSSv2info

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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: No
Local: No
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: 🔍

0-Day Time: 🔍

Patch: 9c6b899f7a46893ab3b671e341a2234e9c0c060e

Timelineinfo

04/05/2017 🔍
04/18/2017 +13 days 🔍
05/31/2017 +43 days 🔍
05/31/2017 +0 days 🔍
07/09/2018 +403 days 🔍
07/09/2018 +0 days 🔍
07/10/2018 +1 days 🔍
07/18/2018 +8 days 🔍
04/05/2023 +1722 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: openwall.com
Researcher: Prasad J Pandit
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7471 (🔍)
GCVE (CVE): GCVE-0-2017-7471
GCVE (VulDB): GCVE-100-120911
SecurityFocus: 97970 - QEMU 'hw/9pfs/9p-local.c' Privilege Escalation Vulnerability

See also: 🔍

Entryinfo

Created: 07/10/2018 09:50
Updated: 04/05/2023 10:23
Changes: 07/10/2018 09:50 (75), 03/03/2020 11:11 (4), 04/05/2023 10:23 (4)
Complete: 🔍
Cache ID: 216::103

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