Alt-N MDaemon up to 9.0.6 POP3 Server User heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Alt-N MDaemon up to 9.0.6. It has been declared as critical. This impacts an unknown function of the component POP3 Server. The manipulation of the argument User results in heap-based overflow. This vulnerability is cataloged as CVE-2006-4364. Furthermore, there is an exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Alt-N MDaemon up to 9.0.6 (Mail Server Software). Affected is some unknown processing of the component POP3 Server. The manipulation of the argument USER with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Multiple heap-based buffer overflows in the POP3 server in Alt-N Technologies MDaemon before 9.0.6 allow remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via long strings that contain @ characters in the (1) USER and (2) APOP commands.

The bug was discovered 08/21/2006. The weakness was shared 08/23/2006 by Sasa Jusic and Leon Juranic with INFIGO IS (Website). The advisory is shared for download at infigo.hr. This vulnerability is traded as CVE-2006-4364 since 08/25/2006. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known.

A public exploit has been developed by Leon Juranic in Perl and been published even before and not after the advisory. The exploit is shared for download at infigo.hr. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 22256 (MDaemon < 9.0.6 POP3 Server USER / APOP Command Remote Overflow), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 74219 (Alt-N MDaemon Multiple Remote Pre-Authentication POP3 Buffer Overflow Vulnerabilities).

Upgrading to version 9.06 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at altn.com. The best possible mitigation is suggested to be upgrading to the latest version. Attack attempts may be identified with Snort ID 1866.

The vulnerability is also documented in the databases at X-Force (28517), Exploit-DB (2245), Tenable (22256), SecurityFocus (BID 19651†) and OSVDB (28125†). The entries VDB-2645, VDB-33104, VDB-37697 and VDB-41529 are related to this item. 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: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Leon Juranic
Programming Language: 🔍
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 22256
Nessus Name: MDaemon < 9.0.6 POP3 Server USER / APOP Command Remote Overflow
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MDaemon 9.06
Patch: altn.com

Snort ID: 1866
Snort Message: PROTOCOL-POP USER overflow attempt
Snort Class: 🔍
SourceFire IPS: 🔍
PaloAlto IPS: 🔍
Fortigate IPS: 🔍

Timelineinfo

08/21/2006 🔍
08/21/2006 +0 days 🔍
08/21/2006 +0 days 🔍
08/22/2006 +1 days 🔍
08/22/2006 +0 days 🔍
08/22/2006 +0 days 🔍
08/23/2006 +1 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/23/2006 +0 days 🔍
08/25/2006 +1 days 🔍
08/26/2006 +1 days 🔍
08/27/2006 +1 days 🔍
08/29/2006 +2 days 🔍
06/16/2025 +6866 days 🔍

Sourcesinfo

Vendor: altn.com

Advisory: infigo.hr
Researcher: Sasa Jusic, Leon Juranic
Organization: INFIGO IS
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-4364 (🔍)
GCVE (CVE): GCVE-0-2006-4364
GCVE (VulDB): GCVE-100-2484
X-Force: 28517 - MDaemon POP3 server USER and APOP command buffer overflow, High Risk
SecurityFocus: 19651 - Alt-N MDaemon Multiple Remote Pre-Authentication POP3 Buffer Overflow Vulnerabilities
Secunia: 21595 - MDaemon POP3 Server Buffer Overflow Vulnerabilities, Moderately Critical
OSVDB: 28125 - MDaemon POP3 Server USER / APOP Command Remote Overflow
SecurityTracker: 1016729
Vulnerability Center: 12583 - Alt-N Mdaemon POP3 Server Heap Based Buffer Overflows Allow Remote DoS and Code Execution, High
Vupen: ADV-2006-3361

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

Entryinfo

Created: 08/29/2006 10:36
Updated: 06/16/2025 14:15
Changes: 08/29/2006 10:36 (106), 06/24/2019 16:30 (6), 07/15/2024 10:56 (17), 06/16/2025 14:15 (3)
Complete: 🔍
Cache ID: 216:DAC:103

Once again VulDB remains the best source for vulnerability data.

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