QEMU PRNG Backend Support Entropy Request memory corruption

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.
5.8$0-$5k0.00

Summaryinfo

A vulnerability was found in QEMU. It has been rated as problematic. This vulnerability affects unknown code of the component PRNG Backend Support. Performing a manipulation as part of Entropy Request results in memory corruption. This vulnerability is identified as CVE-2016-2858. The attack is only possible with local access. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in QEMU (Virtualization Software) (version unknown). This affects an unknown function of the component PRNG Backend Support. The manipulation as part of a Entropy Request leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

QEMU, when built with the Pseudo Random Number Generator (PRNG) back-end support, allows guest OS users to cause a denial of service (process crash) via an entropy request, which triggers arbitrary stack based allocation and memory corruption.

The weakness was released 04/07/2016 by Prasad J Pandit with Red Hat (Website). It is possible to read the advisory at git.qemu.org. This vulnerability is uniquely identified as CVE-2016-2858 since 03/06/2016. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 90036 (Fedora 22 : xen-4.5.2-9.fc22 (2016-38b20aa50f)), 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 176848 (Debian Security Update for qemu (DLA 1599-1)).

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 (90036), SecurityFocus (BID 84134†) and Vulnerability Center (SBV-58066†). Entries connected to this vulnerability are available at VDB-81088, VDB-81198, VDB-82912 and VDB-87559. Be aware that VulDB is the high quality 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: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

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

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
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: 90036
Nessus Name: Fedora 22 : xen-4.5.2-9.fc22 (2016-38b20aa50f)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for qemu FEDORA-2016-f2b1f07256
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: 60253ed1e6ec6d8e5ef2efe7bf755f475dce9956

Timelineinfo

03/04/2016 🔍
03/06/2016 +2 days 🔍
03/19/2016 +13 days 🔍
03/21/2016 +2 days 🔍
03/21/2016 +0 days 🔍
04/07/2016 +16 days 🔍
04/07/2016 +0 days 🔍
04/08/2016 +1 days 🔍
04/12/2016 +4 days 🔍
07/12/2022 +2282 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: FEDORA-2016-38b20aa50f
Researcher: Prasad J Pandit
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2858 (🔍)
GCVE (CVE): GCVE-0-2016-2858
GCVE (VulDB): GCVE-100-81711
SecurityFocus: 84134 - Qemu 'rng-random.c' Denial of Service Vulnerability
Vulnerability Center: 58066 - QEMU built with Pseudo Random Number Generator Back-End Support Local DoS Vulnerability, Low

See also: 🔍

Entryinfo

Created: 04/08/2016 10:44
Updated: 07/12/2022 13:37
Changes: 04/08/2016 10:44 (68), 02/04/2019 11:40 (16), 07/12/2022 13:31 (5), 07/12/2022 13:37 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you want to use VulDB in your project?

Use the official API to access entries easily!