selinux-policy Hardlink SSH 7pk security

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability was found in selinux-policy. It has been declared as problematic. This affects an unknown part of the component Hardlink Handler. Such manipulation leads to 7pk security (SSH). This vulnerability is listed as CVE-2015-3170. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in selinux-policy (version now known). Affected by this issue is some unknown processing of the component Hardlink Handler. The manipulation with an unknown input leads to a 7pk security vulnerability (SSH). Using CWE to declare the problem leads to CWE-254. Impacted is availability. CVE summarizes:

selinux-policy when sysctl fs.protected_hardlinks are set to 0 allows local users to cause a denial of service (SSH login prevention) by creating a hardlink to /etc/passwd from a directory named .config, and updating selinux-policy.

The bug was discovered 06/15/2015. The weakness was presented 07/21/2017 as Bug 1218672 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2015-3170 since 04/10/2015. The attack needs to be approached locally. Required for exploitation is a simple authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1211.

The vulnerability was handled as a non-public zero-day exploit for at least 767 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.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Name: SSH
Class: 7pk security / SSH
CWE: CWE-254
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

04/10/2015 🔍
06/15/2015 +66 days 🔍
07/21/2017 +767 days 🔍
07/21/2017 +0 days 🔍
07/21/2017 +0 days 🔍
10/31/2019 +832 days 🔍

Sourcesinfo

Advisory: Bug 1218672
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-3170 (🔍)
GCVE (CVE): GCVE-0-2015-3170
GCVE (VulDB): GCVE-100-104348
scip Labs: https://www.scip.ch/en/?labs.20140109

Entryinfo

Created: 07/21/2017 20:35
Updated: 10/31/2019 08:54
Changes: 07/21/2017 20:35 (57), 10/31/2019 08:54 (2)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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