KLA12370 Multiple vulnerabilities in Apache HTTP Server

Multiple vulnerabilities were found in Apache HTTP Server. Malicious users can exploit these vulnerabilities to bypass security restrictions, obtain sensitive information, spoof user interface, cause denial of service.

Below is a complete list of vulnerabilities:

1. Security bypass vulnerability in mod_proxy can be exploited via special crafted HTTP/2 method to bypass security restrictions.
2. Buffer overflow vulnerability in ap_escape_quotes can be exploited to spoof user interface or obtain sensitive information.
3. NULL pointer dereference in httpd core can be exploited to cause denial of service.
4. Out of bounds read vulnerability in mod_proxy_uwsgi can be exploited vis special crafted request to cause denial of service.
5. Security bypass vulnerability in mod_proxy can be exploited remotely via special crafted request to cause denial of service.

Original advisories

Fixed in Apache HTTP Server 2.4.49

Exploitation

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Related products

Apache-HTTP-Server

CVE list

CVE-2021-33193 critical

CVE-2021-39275 critical

CVE-2021-34798 critical

CVE-2021-36160 critical

CVE-2021-40438 critical

Solution

Update to the latest version

Download Apache HTTP Server

Impacts

• OSI

Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.

• DoS

Denial of service. Exploitation of vulnerabilities with this impact can lead to loss of system availability or critical functional fault.

• SB

Security bypass. Exploitation of vulnerabilities with this impact can lead to performing actions restricted by current security settings.

• SUI

Spoof user interface. Exploitation of vulnerabilities with this impact can lead to changes in user interface to beguile user into inaccurate behavior.

Affected Products

• Apache HTTP Server earlier than 2.4.49