CVE-2021-3553 : Security Advisory and Response
Discover the impact of CVE-2021-3553, a medium severity SSRF vulnerability in Bitdefender Endpoint Security Tools, Unified Endpoint for Linux, and GravityZone. Learn how to mitigate this security flaw.
A Server-Side Request Forgery (SSRF) vulnerability in the EPPUpdateService of Bitdefender Endpoint Security Tools enables attackers to utilize the Endpoint Protection relay as a proxy for remote hosts. This impacts various Bitdefender products such as Endpoint Security Tools, Unified Endpoint for Linux, and GravityZone.
Understanding CVE-2021-3553
This CVE, discovered on June 5, 2021, has a base score of 5.3, categorizing it as a medium severity vulnerability.
What is CVE-2021-3553?
The SSRF vulnerability in Bitdefender products allows malicious actors to leverage the EPPUpdateService for unauthorized proxy access to external servers.
The Impact of CVE-2021-3553
With a high confidentiality impact, this vulnerability does not require special privileges for exploitation but demands user interaction. Attack complexity is high, and the attack vector is through the network.
Technical Details of CVE-2021-3553
The vulnerability affects various versions of Bitdefender products:
- Bitdefender Endpoint Security Tools versions prior to 6.6.27.390 and 7.1.2.33
- Unified Endpoint for Linux versions prior to 6.2.21.160
- GravityZone versions prior to 6.24.1-1
Vulnerability Description
The SSRF vulnerability in the EPPUpdateService allows attackers to disguise malicious traffic as legitimate requests via the affected Bitdefender products.
Affected Systems and Versions
Bitdefender Endpoint Security Tools, Unified Endpoint for Linux, and GravityZone versions mentioned above are vulnerable to this SSRF flaw.
Exploitation Mechanism
Exploiting this vulnerability involves manipulating the EPPUpdateService to act as a relay for unauthorized access to external systems.
Mitigation and Prevention
To address CVE-2021-3553:
Immediate Steps to Take
Users are advised to update affected Bitdefender products to version 6.6.27.390 to patch the vulnerability.
Long-Term Security Practices
Regularly update and monitor security patches for Bitdefender products to prevent potential SSRF attacks.
Patching and Updates
Deploy automatic updates to ensure patches are applied promptly to mitigate vulnerabilities effectively.