CVE-2023-49087 : Vulnerability Insights and Analysis

This article provides an in-depth analysis of CVE-2023-49087, focusing on the validation of SignedInfo in XML signatures and encryption vulnerabilities.

Understanding CVE-2023-49087

CVE-2023-49087 is related to a vulnerability in the xml-security library affecting versions 1.6.11 and 5.0.0-alpha.12. The issue allows an attacker to manipulate the DigestValue of an XML signature, potentially leading to signature forgery.

What is CVE-2023-49087?

The CVE-2023-49087 vulnerability revolves around insufficient verification of data authenticity during the validation of SignedInfo in XML signatures. Attackers can exploit a bug in PHP's canonicalization function to manipulate the DigestValue, enabling them to forge the signature.

The Impact of CVE-2023-49087

The impact of CVE-2023-49087 can result in the forging of XML signatures, compromising the integrity of signed documents or messages. This vulnerability could lead to unauthorized modifications or the falsification of signed content.

Technical Details of CVE-2023-49087

CVE-2023-49087 has a CVSSv3 base score of 6.8, with a medium severity level. The attack complexity is high, and the integrity impact is significant. The vulnerability affects the 'xml-security' library versions 1.6.11 and 5.0.0-alpha.12.

Vulnerability Description

The vulnerability arises due to insufficient verification of data authenticity when validating SignedInfo in XML signatures. It allows attackers to manipulate the DigestValue, potentially leading to forging the XML signature.

Affected Systems and Versions

The 'xml-security' library versions 1.6.11 and 5.0.0-alpha.12 are impacted by CVE-2023-49087, putting systems that use these versions at risk of signature forgery attacks.

Exploitation Mechanism

By exploiting a bug in PHP's canonicalization function, attackers can tamper with the DigestValue in the XML signature, enabling them to forge the signature and bypass authenticity verification.

Mitigation and Prevention

To mitigate the risks posed by CVE-2023-49087, immediate steps and long-term security measures should be implemented.

Immediate Steps to Take

Users are advised to update the 'xml-security' library to patched versions 1.6.12 and 5.0.0-alpha.13 to address the vulnerability and prevent signature manipulation.

Long-Term Security Practices

Implement secure coding practices, conduct regular security audits, and stay informed about security updates to prevent similar vulnerabilities in the future.

Patching and Updates

Regularly update the 'xml-security' library to the latest secure versions to ensure that known vulnerabilities are addressed and the system remains secure.