Multiple Apache HTTP Server Security Vulnerabilities

Multiple Apache HTTP Server Security Vulnerabilities

março 10, 2023 | NSFOCUS


Recently, NSFOCUS CERT found that Apache has issued an official security notice to fix multiple Apache HTTP Server vulnerabilities. Affected users should take protective measures as soon as possible.

Apache HTTP Server Request Smuggling Vulnerability (CVE-2023-25690):

When mod_ When proxy is enabled with some form of RewriteRule or ProxyPassMatch, a non-specific pattern will match the user’s partial request target (URL). Remote attackers can bypass the access control in the proxy server by constructing malicious HTTP request packets, and proxy the unexpected URL to the existing source server, resulting in cache poisoning.

Apache HTTP Server Response Smuggling Vulnerability (CVE-2023-27522):

Due to the misconfiguration in mod_ proxy_ uwsgi, remote attackers can use this vulnerability to inject arbitrary HTTP headers and cause the server to return a split response. An attacker can further exploit this vulnerability, which may eventually lead to web cache poisoning or cross-site scripting attacks, and obtain sensitive information.

Reference link:

Scope of Impact

Affected version


  • 2.4.0 <= Apache HTTP Server <= 2.4.55


  • 2.4.30 <= Apache HTTP Server <= 2.4.55

Unaffected version


  • Apache HTTP Server >= 2.4.56


  • Apache HTTP Server >= 2.4.56

Vulnerability Detection

Relevant users can determine whether the current application is at risk through version detection.

Use the following command to view the current version of Apache HTTP Server:

httpd -v

If the current version is within the affected range, there may be security risks.


This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.


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