CVE-2019-11072 : Vulnerability Insights and Analysis

Versions of lighttpd prior to 1.4.54 contain a vulnerability related to a signed integer overflow, potentially exploitable by remote attackers. This can lead to a denial of service, such as application crashes, through a malicious HTTP GET request.

Understanding CVE-2019-11072

This CVE involves a specific vulnerability in lighttpd versions before 1.4.54 that can be exploited remotely, potentially causing denial of service.

What is CVE-2019-11072?

The vulnerability is tied to a signed integer overflow in lighttpd versions prior to 1.4.54.
It can be exploited by remote attackers through a malicious HTTP GET request.
The vulnerability is related to mishandling of /%2F? in the burl.c file's burl_normalize_2F_to_slash_fix function.
This issue is associated with a new feature introduced in lighttpd 1.4.50, which must be explicitly configured in the configuration file.

The Impact of CVE-2019-11072

Remote attackers can exploit this vulnerability to cause denial of service, potentially crashing the application.
The vulnerability does not have further exploitable possibilities beyond triggering an abort() and subsequent application exit.

Technical Details of CVE-2019-11072

Versions of lighttpd prior to 1.4.54 are affected by a signed integer overflow vulnerability that can be exploited remotely.

Vulnerability Description

The vulnerability is related to a signed integer overflow in lighttpd versions before 1.4.54.
It can be triggered by a malicious HTTP GET request, specifically in the mishandling of /%2F? within the burl.c file's burl_normalize_2F_to_slash_fix function.

Affected Systems and Versions

Versions of lighttpd before 1.4.54 are affected by this vulnerability.
The feature associated with the vulnerability must be explicitly configured in the configuration file.

Exploitation Mechanism

Remote attackers can exploit this vulnerability through a malicious HTTP GET request.
The vulnerability is tied to mishandling of /%2F? in the burl.c file's burl_normalize_2F_to_slash_fix function.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-11072 vulnerability.

Immediate Steps to Take

Update lighttpd to version 1.4.54 or later to mitigate the vulnerability.
Ensure that the vulnerable feature is not explicitly configured in the configuration file.

Long-Term Security Practices

Regularly monitor for security updates and patches for lighttpd.
Implement network security measures to prevent remote exploitation.

Patching and Updates

Apply patches provided by lighttpd to address the signed integer overflow vulnerability.