QEMU hw/9pfs/9p.c v9fs_xattrwalk race condition

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in QEMU. This vulnerability affects the function v9fs_xattrwalk of the file hw/9pfs/9p.c. This manipulation causes race condition. This vulnerability is registered as CVE-2017-15038. The attack needs to be launched locally. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in QEMU (Virtualization Software) (affected version unknown). Affected by this vulnerability is the function v9fs_xattrwalk of the file hw/9pfs/9p.c. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality. The summary by CVE is:

Race condition in the v9fs_xattrwalk function in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allows local guest OS users to obtain sensitive information from host heap memory via vectors related to reading extended attributes.

The bug was discovered 10/04/2017. The weakness was published 10/10/2017 by Jiang Xin with Huawei (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2017-15038 since 10/05/2017. An attack has to be approached locally. The successful exploitation needs a single authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 103713 (Debian DLA-1128-1 : 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 157870 (Oracle Enterprise Linux Security Update for qemu (ELSA-2018-4285)).

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 (103713) and SecurityFocus (BID 102518†). Similar entries are available at VDB-104779, VDB-104780, VDB-105675 and VDB-105918. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.6
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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Exploitinginfo

Class: Race condition
CWE: CWE-362
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: 103713
Nessus Name: Debian DLA-1128-1 : qemu-kvm security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 862180
OpenVAS Name: SuSE Update for qemu openSUSE-SU-2017:2938-1 (qemu)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/04/2017 🔍
10/05/2017 +1 days 🔍
10/08/2017 +3 days 🔍
10/09/2017 +1 days 🔍
10/09/2017 +0 days 🔍
10/10/2017 +1 days 🔍
10/10/2017 +0 days 🔍
12/25/2017 +76 days 🔍
01/03/2023 +1835 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: USN-3575-1
Researcher: Jiang Xin
Organization: Huawei
Status: Confirmed

CVE: CVE-2017-15038 (🔍)
GCVE (CVE): GCVE-0-2017-15038
GCVE (VulDB): GCVE-100-107605

OVAL: 🔍

SecurityFocus: 102518 - QEMU CVE-2018-5683 Denial of Service Vulnerability

See also: 🔍

Entryinfo

Created: 10/10/2017 10:04
Updated: 01/03/2023 07:55
Changes: 10/10/2017 10:04 (72), 11/23/2019 08:21 (8), 01/03/2023 07:55 (4)
Complete: 🔍
Cache ID: 216::103

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