CVE-2021-36093 : Security Advisory and Response
Learn about CVE-2021-36093, a Medium severity DoS vulnerability in OTRS software where attackers exploit PostMaster filters to cause email processing delays, potentially leading to DoS attacks. Take immediate steps and update to secure your systems.
A denial-of-service (DoS) vulnerability was discovered in OTRS software, allowing attackers to exploit PostMaster filters, causing email processing delays that lead to DoS attacks.
Understanding CVE-2021-36093
This CVE identifies a security flaw in OTRS that impacts certain versions of the ((OTRS)) Community Edition and OTRS, potentially resulting in DoS attacks.
What is CVE-2021-36093?
The vulnerability allows the creation of emails that get stuck during processing by PostMaster filters, leading to DoS conditions. Affected versions include OTRS AG ((OTRS)) Community Edition 6.0.1 and later, OTRS 7.0.28, and prior, as well as 8.0.15 and prior versions.
The Impact of CVE-2021-36093
With a CVSS base score of 5.3 (Medium Severity), this vulnerability presents a low attack complexity scenario where an attacker can exploit network-based attacks to disrupt service availability without requiring special privileges.
Technical Details of CVE-2021-36093
The vulnerability is classified under CWE-185 (Incorrect Regular Expression) and was discovered through user interaction. The impact primarily affects system availability.
Vulnerability Description
The issue arises from the handling of emails by PostMaster filters in OTRS, leading to processing delays and potential DoS attacks.
Affected Systems and Versions
- ((OTRS)) Community Edition 6.0.x version 6.0.1 and later
- OTRS 7.0.x version 7.0.28 and prior, 8.0.x version 8.0.15 and prior
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting specific emails that trigger the PostMaster filters to cause processing delays, resulting in DoS conditions.
Mitigation and Prevention
It is crucial to take immediate action to secure your systems against this vulnerability to prevent potential DoS attacks.
Immediate Steps to Take
- Update OTRS to version 8.0.16 or OTRS 7.0.29 to mitigate the security risk.
Long-Term Security Practices
Regularly monitor and update your OTRS installations to stay protected against emerging threats.
Patching and Updates
Apply security patches and updates provided by OTRS AG to address CVE-2021-36093 and enhance the security of your systems.