Double Precision Incorporated Courier MTA up to 0.53.1 denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k0.00

A vulnerability has been found in Double Precision Incorporated Courier MTA up to 0.53.1 and classified as critical. This vulnerability affects an unknown function. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

libs/comverp.c in Courier MTA before 0.53.2 allows attackers to cause a denial of service (CPU consumption) via unknown vectors involving usernames that contain the "=" (equals) character, which is not properly handled during encoding.

The bug was discovered 05/25/2006. The weakness was presented 05/30/2006 (Website). The advisory is available at courier-mta.org. This vulnerability was named CVE-2006-2659 since 05/30/2006. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 22643 (Debian DSA-1101-1 : courier - programming error), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l.

Upgrading to version 0.53.2 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (26998) and Tenable (22643).

Productinfo

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Version

CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.5
VulDB Temp Score: 6.7
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CVSSv2info

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Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

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Nessus ID: 22643
Nessus Name: Debian DSA-1101-1 : courier - programming error
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OpenVAS ID: 57001
OpenVAS Name: Debian Security Advisory DSA 1101-1 (courier)
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Upgrade: Courier MTA 0.53.2

Timelineinfo

05/25/2006 🔍
05/30/2006 +5 days 🔍
05/30/2006 +0 days 🔍
05/30/2006 +0 days 🔍
05/30/2006 +0 days 🔍
06/08/2006 +9 days 🔍
06/08/2006 +0 days 🔍
06/09/2006 +1 days 🔍
06/23/2006 +14 days 🔍
08/07/2006 +45 days 🔍
10/14/2006 +68 days 🔍
03/12/2015 +3071 days 🔍
06/24/2019 +1565 days 🔍

Sourcesinfo

Advisory: courier-mta.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-2659 (🔍)
X-Force: 26998
SecurityTracker: 1016248
Vulnerability Center: 12455 - Courier MTA Denial of Service in libs/comverp.c, High
SecurityFocus: 18345 - Courier Mail Server Username Encoding Remote Denial Of Service Vulnerability
Secunia: 20519 - Courier Mail Server Username Encoding Denial of Service, Moderately Critical
OSVDB: 26232 - CVE-2006-2659 - Courier Mail Server - Denial-Of-Service Issue
Vupen: ADV-2006-2214

Entryinfo

Created: 03/12/2015 12:19
Updated: 06/24/2019 07:47
Changes: 03/12/2015 12:19 (83), 06/24/2019 07:47 (4)
Complete: 🔍

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