VDB-97588 · CVE-2016-6239 · BID 91805

OpenBSD 5.8/5.9 __MAP_NOFAULT size input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in OpenBSD 5.8/5.9. The impacted element is the function __MAP_NOFAULT. Executing a manipulation of the argument size can lead to input validation. This vulnerability appears as CVE-2016-6239. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in OpenBSD 5.8/5.9 (Operating System). This vulnerability affects the function __MAP_NOFAULT. The manipulation of the argument size with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

The mmap extension __MAP_NOFAULT in OpenBSD 5.8 and 5.9 allows attackers to cause a denial of service (kernel panic and crash) via a large size value.

The bug was discovered 06/27/2016. The weakness was presented 03/07/2017 by Jesse Hertz (oss-sec). The advisory is shared for download at openwall.com. This vulnerability was named CVE-2016-6239 since 07/17/2016. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/05/2024).

The vulnerability was handled as a non-public zero-day exploit for at least 253 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at SecurityFocus (BID 91805†) and SecurityTracker (ID 1036318†). See VDB-97589, VDB-97590, VDB-97591 and VDB-97592 for similar entries. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.2
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/27/2016 🔍
07/17/2016 +20 days 🔍
07/17/2016 +0 days 🔍
03/07/2017 +233 days 🔍
03/07/2017 +0 days 🔍
03/07/2017 +0 days 🔍
12/05/2024 +2830 days 🔍

Sourcesinfo

Advisory: openwall.com
Researcher: Jesse Hertz
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-6239 (🔍)
GCVE (CVE): GCVE-0-2016-6239
GCVE (VulDB): GCVE-100-97588
SecurityFocus: 91805 - OpenBSD Multiple Memory Corruption and Denial of Service Vulnerabilities
OSVDB: - CVE-2016-6239 - OpenBSD - Denial of Service Issue
SecurityTracker: 1036318

See also: 🔍

Entryinfo

Created: 03/07/2017 21:54
Updated: 12/05/2024 15:03
Changes: 03/07/2017 21:54 (61), 09/04/2020 12:22 (5), 12/05/2024 15:03 (17)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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