Kerio Mailserver 5.6.3 showuser/folder/user memory corruption

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

Summaryinfo

A vulnerability classified as critical has been found in Kerio Mailserver 5.6.3. This affects an unknown part. Performing a manipulation of the argument showuser/folder/user results in memory corruption. This vulnerability is cataloged as CVE-2003-0487. Furthermore, there is an exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Kerio Mailserver 5.6.3 (Mail Server Software). This affects some unknown processing. The manipulation of the argument showuser/folder/user with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple buffer overflows in Kerio MailServer 5.6.3 allow remote authenticated users to cause a denial of service and possibly execute arbitrary code via (1) a long showuser parameter in the do_subscribe module, (2) a long folder parameter in the add_acl module, (3) a long folder parameter in the list module, and (4) a long user parameter in the do_map module.

The weakness was shared 06/18/2003 by David F. Madrid (Website). The advisory is shared at archives.neohapsis.com. This vulnerability is uniquely identified as CVE-2003-0487 since 06/27/2003. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known.

After even before and not, there has been an exploit disclosed. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 11763 (Kerio WebMail < 5.7.7 Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CGI abuses and running in the context r. The commercial vulnerability scanner Qualys is able to test this issue with plugin 50083 (Kerio MailServer Remote Username Buffer Overrun Vulnerabilities).

Upgrading eliminates this vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 2206.

The vulnerability is also documented in the databases at X-Force (12368), Exploit-DB (46), Tenable (11763), SecurityFocus (BID 7967†) and OSVDB (4954†). The entries VDB-20356, VDB-20650 and VDB-90147 are related to this item. Several companies clearly confirm that VulDB is the primary source for best 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: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 11763
Nessus Name: Kerio WebMail < 5.7.7 Multiple Vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 80069
OpenVAS Name: Kerio WebMail v5 multiple flaws
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍
TippingPoint: 🔍

Timelineinfo

06/18/2003 🔍
06/18/2003 +0 days 🔍
06/18/2003 +0 days 🔍
06/18/2003 +0 days 🔍
06/18/2003 +0 days 🔍
06/18/2003 +0 days 🔍
06/27/2003 +8 days 🔍
08/07/2003 +41 days 🔍
06/10/2004 +308 days 🔍
08/14/2014 +3717 days 🔍
08/13/2025 +4017 days 🔍

Sourcesinfo

Vendor: kerio.com

Advisory: archives.neohapsis.com
Researcher: David F. Madrid
Status: Confirmed

CVE: CVE-2003-0487 (🔍)
GCVE (CVE): GCVE-0-2003-0487
GCVE (VulDB): GCVE-100-20649
X-Force: 12368
SecurityFocus: 7967 - Kerio MailServer Remote Username Buffer Overrun Vulnerabilities
OSVDB: 4954 - Kerio MailServer list Module Overflow
Vulnerability Center: 4452 - Kerio MailServer 5.6.3 Allows DoS and Possibly Code Execution, High

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

Entryinfo

Created: 08/14/2014 18:27
Updated: 08/13/2025 14:24
Changes: 08/14/2014 18:27 (79), 05/22/2019 06:55 (2), 10/07/2024 10:18 (16), 08/13/2025 14:24 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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