VDB-97592 · CVE-2016-6243 · BID 91805

OpenBSD 5.8/5.9 kern/kern_synch.c thrsleep tsp input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in OpenBSD 5.8/5.9. Affected by this vulnerability is the function thrsleep of the file kern/kern_synch.c. Such manipulation of the argument tsp leads to input validation. This vulnerability is uniquely identified as CVE-2016-6243. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in OpenBSD 5.8/5.9 (Operating System) and classified as problematic. Affected by this issue is the function thrsleep of the file kern/kern_synch.c. The manipulation of the argument tsp with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

thrsleep in kern/kern_synch.c in OpenBSD 5.8 and 5.9 allows local users to cause a denial of service (kernel panic) via a crafted value in the tsp parameter of the __thrsleep system call.

The bug was discovered 06/27/2016. The weakness was disclosed 03/07/2017 by Jesse Hertz (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is handled as CVE-2016-6243 since 07/17/2016. The attack needs to be approached locally. The requirement for exploitation is a simple authentication. 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 09/04/2020).

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 vulnerability database at SecurityFocus (BID 91805†). The entries VDB-97589, VDB-97590, VDB-97591 and VDB-97594 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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 🔍
09/04/2020 +1277 days 🔍

Sourcesinfo

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

CVE: CVE-2016-6243 (🔍)
GCVE (CVE): GCVE-0-2016-6243
GCVE (VulDB): GCVE-100-97592
SecurityFocus: 91805 - OpenBSD Multiple Memory Corruption and Denial of Service Vulnerabilities
OSVDB: - CVE-2016-6243 - OpenBSD - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 03/07/2017 21:47
Updated: 09/04/2020 12:47
Changes: 03/07/2017 21:47 (61), 09/04/2020 12:47 (6)
Complete: 🔍
Cache ID: 216::103

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