mod_ssl/Apache-ssl dbm/shm Session Cache i2d_SSL_SESSION memory corruption

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in mod_ssl and Apache-ssl. Affected by this issue is the function i2d_SSL_SESSION of the component dbm/shm Session Cache. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2002-0082. Furthermore, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in mod_ssl and Apache-ssl (version now known). This issue affects the function i2d_SSL_SESSION of the component dbm/shm Session Cache. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The dbm and shm session cache code in mod_ssl before 2.8.7-1.3.23, and Apache-SSL before 1.3.22+1.46, does not properly initialize memory using the i2d_SSL_SESSION function, which allows remote attackers to use a buffer overflow to execute arbitrary code via a large client certificate that is signed by a trusted Certificate Authority (CA), which produces a large serialized session.

The weakness was published 03/15/2002 with Apache as not defined posting (Bugtraq). It is possible to read the advisory at online.securityfocus.com. The identification of this vulnerability is CVE-2002-0082. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

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 14957 (Debian DSA-120-1 : mod_ssl - buffer overflow), 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. The commercial vulnerability scanner Qualys is able to test this issue with plugin 86314 (Apache Mod_SSL Buffer Overflow Vulnerability).

Upgrading eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (8308), Exploit-DB (21671), Tenable (14957), SecurityFocus (BID 4189†) and Vulnerability Center (SBV-373†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

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
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

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: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 14957
Nessus Name: Debian DSA-120-1 : mod_ssl - buffer overflow
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 53577
OpenVAS Name: Debian Security Advisory DSA 120-1 (libapache-mod-ssl, apache-ssl)
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: 🔍

Timelineinfo

02/27/2002 🔍
03/10/2002 +11 days 🔍
03/15/2002 +5 days 🔍
03/15/2002 +0 days 🔍
03/15/2002 +0 days 🔍
12/12/2002 +272 days 🔍
09/29/2004 +657 days 🔍
07/11/2014 +3572 days 🔍
09/23/2025 +4092 days 🔍

Sourcesinfo

Advisory: online.securityfocus.com⛔
Organization: Apache
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2002-0082 (🔍)
GCVE (CVE): GCVE-0-2002-0082
GCVE (VulDB): GCVE-100-17975
X-Force: 8308
SecurityFocus: 4189 - Apache mod_ssl/Apache-SSL Buffer Overflow Vulnerability
Vulnerability Center: 373 - Buffer Overflow in Apache mod_ssl/Apache-SSL, Medium

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

Entryinfo

Created: 07/11/2014 13:41
Updated: 09/23/2025 02:00
Changes: 07/11/2014 13:41 (72), 05/06/2019 16:09 (1), 03/09/2025 19:19 (27), 09/23/2025 02:00 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to stay up to date on a daily basis?

Enable the mail alert feature now!