CVE-2019-10098 : Security Advisory and Response

Apache HTTP Server versions 2.4.0 to 2.4.39 are susceptible to a vulnerability where redirects configured with mod_rewrite may be tricked by encoded newlines, redirecting to unintended URLs within the original request URL.

Understanding CVE-2019-10098

This CVE involves a potential open redirect vulnerability in mod_rewrite configurations within Apache HTTP Server versions 2.4.0 to 2.4.39.

What is CVE-2019-10098?

In Apache HTTP Server versions 2.4.0 to 2.4.39, redirects set up with mod_rewrite can be misled by encoded newlines, causing the redirect to occur to an unexpected URL within the original request URL.

The Impact of CVE-2019-10098

This vulnerability could be exploited by attackers to redirect users to malicious websites, potentially leading to phishing attacks or the download of malware onto the victim's system.

Technical Details of CVE-2019-10098

Apache HTTP Server versions 2.4.0 to 2.4.39 are affected by this vulnerability due to issues in how mod_rewrite handles redirects.

Vulnerability Description

The vulnerability allows attackers to manipulate redirects configured with mod_rewrite, leading to redirection to unintended URLs within the original request URL.

Affected Systems and Versions

Product: Apache HTTP Server
Versions: 2.4.0 to 2.4.39

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting requests with encoded newlines, tricking the mod_rewrite module into redirecting to unexpected URLs.

Mitigation and Prevention

To address CVE-2019-10098, follow these mitigation steps:

Immediate Steps to Take

Apply patches provided by Apache to fix the vulnerability.
Monitor and review server logs for any suspicious activity related to unexpected redirects.

Long-Term Security Practices

Regularly update Apache HTTP Server to the latest version to prevent known vulnerabilities.
Implement strict input validation to prevent malicious input from being processed.

Patching and Updates

Stay informed about security advisories from Apache and promptly apply any patches released to address vulnerabilities.