FreeBSD 10.1/10.2/10.3/11.0 bhyve integer overflow

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

Summaryinfo

A vulnerability was found in FreeBSD 10.1/10.2/10.3/11.0. It has been classified as critical. Affected by this vulnerability is an unknown functionality of the component bhyve. This manipulation causes integer overflow. This vulnerability appears as CVE-2016-1889. The attack requires local access. There is no available exploit. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability has been found in FreeBSD 10.1/10.2/10.3/11.0 (Operating System) and classified as critical. Affected by this vulnerability is an unknown code block of the component bhyve. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in the bhyve hypervisor in FreeBSD 10.1, 10.2, 10.3, and 11.0 when configured with a large amount of guest memory, allows local users to gain privilege via a crafted device descriptor.

The bug was discovered 12/06/2016. The weakness was presented 12/06/2016 by Felix Wilhelm as FreeBSD-SA-16:38.bhyve as confirmed security advisory (Website). The advisory is shared at security.FreeBSD.org. The public release was coordinated in cooperation with the project team. This vulnerability is known as CVE-2016-1889 since 01/13/2016. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The advisory points out:

The bounds checking of accesses to guest memory greater than 4GB by device emulations is subject to integer overflow.

The vulnerability scanner Nessus provides a plugin with the ID 95588 (FreeBSD : FreeBSD -- bhyve(8) virtual machine escape (e722e3c6-bbee-11e6-b1cf-14dae9d210b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (95588) and SecurityTracker (ID 1037400†). See VDB-93972 for similar entry. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
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: 95588
Nessus Name: FreeBSD : FreeBSD -- bhyve(8) virtual machine escape (e722e3c6-bbee-11e6-b1cf-14dae9d210b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Timelineinfo

01/13/2016 🔍
12/06/2016 +328 days 🔍
12/06/2016 +0 days 🔍
12/06/2016 +0 days 🔍
12/06/2016 +0 days 🔍
12/07/2016 +1 days 🔍
12/07/2016 +0 days 🔍
02/15/2017 +70 days 🔍
06/20/2019 +855 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-16:38.bhyve
Researcher: Felix Wilhelm
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2016-1889 (🔍)
GCVE (CVE): GCVE-0-2016-1889
GCVE (VulDB): GCVE-100-93973
SecurityTracker: 1037400

See also: 🔍

Entryinfo

Created: 12/07/2016 10:41
Updated: 06/20/2019 14:48
Changes: 12/07/2016 10:41 (66), 06/20/2019 14:48 (10)
Complete: 🔍
Cache ID: 216::103

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