QEMU hw/9pfs/9p.c v9fs_create/v9fs_lcreate resource management

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in QEMU. The affected element is the function v9fs_create/v9fs_lcreate of the file hw/9pfs/9p.c. Executing a manipulation can lead to resource management. This vulnerability is handled as CVE-2017-7377. It is possible to launch the attack on the local host. There is not any exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (affected version not known). It has been declared as problematic. This vulnerability affects the function v9fs_create/v9fs_lcreate of the file hw/9pfs/9p.c. The manipulation with an unknown input leads to a resource management vulnerability. The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect availability. CVE summarizes:

The (1) v9fs_create and (2) v9fs_lcreate functions in hw/9pfs/9p.c in QEMU (aka Quick Emulator) allow local guest OS privileged users to cause a denial of service (file descriptor or memory consumption) via vectors related to an already in-use fid.

The bug was discovered 03/28/2017. The weakness was released 04/10/2017 by Li Qiang with 360.cn Inc. (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2017-7377 since 03/31/2017. The attack needs to be approached locally. A single authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 13 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 99405 (Fedora 24 : xen (2017-03dc811be6)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora 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)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.qemu-project.org. A possible mitigation has been published 4 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (99405) and SecurityFocus (BID 97319†). Entries connected to this vulnerability are available at VDB-98316, VDB-100418, VDB-100808 and VDB-100809. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.6

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

NVD Base Score: 6.0
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 99405
Nessus Name: Fedora 24 : xen (2017-03dc811be6)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for xen FEDORA-2017-054729ab08
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: d63fb193e71644a073b77ff5ac6f1216f2f6cf6e

Timelineinfo

03/28/2017 🔍
03/31/2017 +3 days 🔍
04/03/2017 +3 days 🔍
04/10/2017 +7 days 🔍
04/10/2017 +0 days 🔍
04/11/2017 +1 days 🔍
04/14/2017 +3 days 🔍
04/17/2017 +3 days 🔍
11/28/2022 +2051 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: FEDORA-2017-03dc811be6
Researcher: Li Qiang
Organization: 360.cn Inc.
Status: Not defined
Confirmation: 🔍

CVE: CVE-2017-7377 (🔍)
GCVE (CVE): GCVE-0-2017-7377
GCVE (VulDB): GCVE-100-99556
SecurityFocus: 97319 - QEMU 'hw/9pfs/9p.c' Multiple Denial of Service Vulnerabilities
OSVDB: - CVE-2017-7377 - QEMU - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 04/11/2017 09:46
Updated: 11/28/2022 09:07
Changes: 04/11/2017 09:46 (77), 08/28/2020 17:04 (7), 11/28/2022 09:05 (5), 11/28/2022 09:07 (1)
Complete: 🔍
Cache ID: 216:B14:103

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!