CVE-2023-41339 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2023-41339, a vulnerability in GeoServer that leads to unauthenticated SSRF due to unsecured WMS dynamic styling parameter.

Understanding CVE-2023-41339

GeoServer, an open-source software written in Java, is affected by a vulnerability that enables an attacker to perform Server-Side Request Forgery (SSRF) through unauthenticated blind SSRF in GeoServer.

What is CVE-2023-41339?

The CVE-2023-41339 vulnerability in GeoServer arises from the unsecured WMS dynamic styling parameter, allowing for blind unauthenticated SSRF. By manipulating the

sld=<url>

parameter, attackers can exploit this vulnerability to execute SSRF attacks.

The Impact of CVE-2023-41339

The vulnerability poses a high severity threat with a CVSS base score of 8.6. Attackers can compromise the confidentiality of user data and potentially access and misuse sensitive information.

Technical Details of CVE-2023-41339

The vulnerability description, affected systems and versions, and exploitation mechanism are vital aspects to comprehend for effective mitigation.

Vulnerability Description

GeoServer's unsecured WMS dynamic styling allows attackers to carry out blind unauthenticated SSRF. Lack of URL checks in place while using dynamic styles creates an opening for SSRF attacks.

Affected Systems and Versions

Affected Vendor: GeoServer
Affected Product: GeoServer
Vulnerable Versions:
< 2.22.5

= 2.23.0, < 2.23.2

Exploitation Mechanism

Exploiting the

sld=<url>

parameter in GeoServer's WMS operations provides attackers the opportunity to execute SSRF attacks, posing significant risks to user data and system integrity.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are essential to safeguard against CVE-2023-41339.

Immediate Steps to Take

Update GeoServer to patched versions 2.22.5 or 2.23.2 to mitigate the vulnerability.
Implement URL checks and ensure proper validation of user input to prevent SSRF attacks.

Long-Term Security Practices

Regularly update software and apply security patches promptly to prevent exploitation of known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate potential security loopholes.

Patching and Updates

Refer to the official GeoServer releases for versions 2.22.5 and 2.23.2 to apply the necessary patches and protect systems from CVE-2023-41339.