VDB-97595 · CVE-2016-6246 · BID 91805

OpenBSD 5.8/5.9 tmpfs username/groupname/devicename input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenBSD 5.8/5.9. This vulnerability affects unknown code of the component tmpfs Handler. The manipulation of the argument username/groupname/devicename leads to input validation. This vulnerability is referenced as CVE-2016-6246. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability was found in OpenBSD 5.8/5.9 (Operating System). It has been rated as problematic. This issue affects an unknown functionality of the component tmpfs Handler. The manipulation of the argument username/groupname/devicename 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. The summary by CVE is:

OpenBSD 5.8 and 5.9 allows certain local users with kern.usermount privileges to cause a denial of service (kernel panic) by mounting a tmpfs with a VNOVAL in the (1) username, (2) groupname, or (3) device name of the root node.

The bug was discovered 06/27/2016. The weakness was published 03/07/2017 by Jesse Hertz (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-6246 since 07/17/2016. Attacking locally is a requirement. The successful exploitation needs a simple authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (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†). Similar entries are available at VDB-97589, VDB-97590, VDB-97591 and VDB-97592. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 5.0

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

NVD Base Score: 4.4
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-2016-6246 (🔍)
GCVE (CVE): GCVE-0-2016-6246
GCVE (VulDB): GCVE-100-97595
SecurityFocus: 91805 - OpenBSD Multiple Memory Corruption and Denial of Service Vulnerabilities
OSVDB: - CVE-2016-6246 - OpenBSD - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 03/07/2017 21:47
Updated: 09/04/2020 13:00
Changes: 03/07/2017 21:47 (60), 09/04/2020 13:00 (6)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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