Critical Vulnerability Alert: CVE-2022-28615 in Apache HTTP Server (Versions 2.4.53 and Earlier)

Executive Summary

CVE-2022-28615 represents a critical vulnerability within the Apache HTTP Server, specifically affecting versions 2.4.53 and earlier. This vulnerability is rooted in an out-of-bounds read within the

ap_strcmp_match()

function, which can be exploited by providing an excessively large input buffer. The potential consequences of this flaw include server crashes and information disclosure. While no code distributed with the server can be directly exploited, third-party modules or Lua scripts utilizing

ap_strcmp_match()

may be vulnerable. Given the critical nature of this vulnerability, it is imperative for organizations to take immediate action to mitigate potential risks.

Technical Information

The vulnerability CVE-2022-28615 is characterized by an out-of-bounds read in the

ap_strcmp_match()

function of the Apache HTTP Server. This function is responsible for comparing strings and is integral to various server operations. The flaw arises when an attacker provides an input buffer that exceeds the expected size, leading to memory access beyond the allocated buffer. This can result in a server crash or, in more severe cases, information disclosure. The Common Vulnerability Scoring System (CVSS) v3.1 assigns this vulnerability a score of 9.1, categorizing it as critical. The vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H indicates that the attack is network-based, requires low complexity, and does not require privileges or user interaction. The impact is high on confidentiality and availability, with no impact on integrity. Affected versions include Apache HTTP Server up to 2.4.53, openSUSE Leap 15.3 and 15.4 with apache2, and certain versions of Fedora. The vulnerability is particularly concerning for environments utilizing third-party modules or Lua scripts that may invoke the vulnerable function.

Exploitation in the Wild

To date, there have been no confirmed instances of CVE-2022-28615 being actively exploited in the wild. Furthermore, no known exploits have been developed for this vulnerability, and no Advanced Persistent Threat (APT) groups have been identified as targeting it. Despite the absence of active exploitation, the critical nature of the vulnerability necessitates vigilance and proactive measures to prevent potential attacks. Organizations should remain alert to any developments and ensure that their systems are adequately protected.

APT Groups using this vulnerability

Currently, there are no known APT groups exploiting CVE-2022-28615. However, given the criticality of the vulnerability, it is essential for organizations to remain vigilant and monitor for any emerging threats. The lack of active exploitation should not lead to complacency, as threat actors may seek to leverage this vulnerability in the future.

Affected Product Versions

The products affected by CVE-2022-28615 include Apache HTTP Server versions up to and including 2.4.53. Additionally, openSUSE Leap 15.3 and 15.4 with apache2, as well as certain versions of Fedora, are impacted. Organizations using these versions should prioritize upgrading to mitigate potential risks.

Workaround and Mitigation

The primary mitigation strategy for CVE-2022-28615 is to upgrade to Apache HTTP Server version 2.4.54 or later, where the vulnerability has been addressed. Organizations should also conduct a thorough review of any third-party modules or Lua scripts in use to ensure they do not call the

ap_strcmp_match()

function with untrusted input. Regular monitoring for security updates from Apache and prompt application of patches are essential to maintaining a secure environment.

References

For further information on CVE-2022-28615, please refer to the following resources: NVD CVE-2022-28615, Apache HTTP Server Security Vulnerabilities, Red Hat Security Advisory, Gentoo Security Advisory, and NetApp Security Advisory.

Rescana is here for you

At Rescana, we are committed to helping our customers navigate the complex landscape of cybersecurity threats. Our Continuous Threat and Exposure Management (CTEM) platform is designed to provide comprehensive insights and proactive measures to safeguard your organization. Should you have any questions regarding this report or any other cybersecurity concerns, please do not hesitate to reach out to our team at ops@rescana.com. We are here to support you in maintaining a secure and resilient environment.