CVE-2023-49087

Public Exploit
Validation of SignedInfo

Description

xml-security is a library that implements XML signatures and encryption. Validation of an XML signature requires verification that the hash value of the related XML-document matches a specific DigestValue-value, but also that the cryptographic signature on the SignedInfo-tree (the one that contains the DigestValue) verifies and matches a trusted public key. If an attacker somehow (i.e. by exploiting a bug in PHP's canonicalization function) manages to manipulate the canonicalized version's DigestValue, it would be possible to forge the signature. This issue has been patched in version 1.6.12 and 5.0.0-alpha.13.

Category

6.8
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.21%
Vendor Advisory github.com
Affected: simplesamlphp xml-security
Published at:
Updated at:

References

Link Tags
https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r vendor advisory exploit
https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581 patch

Frequently Asked Questions

What is the severity of CVE-2023-49087?
CVE-2023-49087 has been scored as a medium severity vulnerability.
How to fix CVE-2023-49087?
To fix CVE-2023-49087, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-49087 being actively exploited in the wild?
It is possible that CVE-2023-49087 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-49087?
CVE-2023-49087 affects simplesamlphp xml-security.
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