CVE-2023-49087 Validation of SignedInfo

What is CVE-2023-49087?

CVE-2023-49087 is a medium-severity vulnerability in simplesamlphp xml-security, published on 30 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-345

Which versions are affected by CVE-2023-49087?

4 open source packages ship an affected version, including simplesamlphp/xml-security and simplesamlphp/saml2. It affects 2 products.

Products include Simplesamlphp Saml2, Simplesamlphp Xml-Security.

How do I fix CVE-2023-49087?

Upgrade simplesamlphp/xml-security to 1.6.12 or later.

Is CVE-2023-49087 being exploited?

There is no known exploitation of CVE-2023-49087 in the wild and no public exploit code.

Other vulnerabilities in simplesamlphp xml-security

• CVE-2016-9814 SimpleSAMLphp SAML2 spoof SAML responses Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-ww7x-3gxh-qm6r.