Debian Linux 6.0/7.0/7.1 improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Debian Linux 6.0/7.0/7.1. It has been declared as problematic. This affects an unknown function. Such manipulation leads to improper authentication. This vulnerability is documented as CVE-2013-6890. Additionally, an exploit exists.

Detailsinfo

A vulnerability was found in Debian Linux 6.0/7.0/7.1 (Operating System) and classified as problematic. Affected by this issue is some unknown processing. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is availability. CVE summarizes:

denyhosts 2.6 uses an incorrect regular expression when analyzing authentication logs, which allows remote attackers to cause a denial of service (incorrect block of IP addresses) via crafted login names.

The weakness was released 12/23/2013 as Bug 1045982 as not defined bug report (Bugzilla). The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2013-6890 since 11/28/2013. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available.

The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 71586 (Debian DSA-2826-1 : denyhosts - remote denial of ssh service), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175265 (Debian Security Update for denyhosts (DSA-2826-2)).

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 Exploit-DB (38909), Tenable (71586), SecurityFocus (BID 64478†), Secunia (SA56239†) and Vulnerability Center (SBV-42737†). Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 71586
Nessus Name: Debian DSA-2826-1 : denyhosts - remote denial of ssh service
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 702826
OpenVAS Name: Debian Security Advisory DSA 2826-1 (denyhosts - Remote denial of ssh service
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/28/2013 🔍
12/19/2013 +21 days 🔍
12/23/2013 +4 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/23/2013 +0 days 🔍
12/30/2013 +7 days 🔍
03/24/2015 +449 days 🔍
12/23/2024 +3562 days 🔍

Sourcesinfo

Vendor: debian.org

Advisory: Bug 1045982
Status: Not defined

CVE: CVE-2013-6890 (🔍)
GCVE (CVE): GCVE-0-2013-6890
GCVE (VulDB): GCVE-100-65876

OVAL: 🔍

SecurityFocus: 64478
Secunia: 56239 - Debian update for denyhosts, Less Critical
Vulnerability Center: 42737 - SourceForge Denyhosts 2.6 Remote Denial of Service via Crafted Login Names, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/24/2015 15:54
Updated: 12/23/2024 03:39
Changes: 03/24/2015 15:54 (66), 05/18/2017 17:36 (4), 01/18/2022 09:21 (3), 11/20/2024 05:13 (25), 12/23/2024 03:39 (7)
Complete: 🔍
Cache ID: 216::103

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