Validation of SignedInfo
Validation of an XML Signature requires verification that the hash value of the related XML-document (after any optional transformations and/or normalizations) matches a specific DigestValue-value, but also that the cryptografic signature on the SignedInfo-tree (the one that contains the DigestValue) verifies and matches a trusted public key.
Within the simpleSAMLphp/xml-security library (https://github.com/simplesamlphp/xml-security), the hash is being validated using SignedElementTrait::validateReference, and the signature is being verified in SignedElementTrait::verifyInternal
https://github.com/simplesamlphp/xml-security/blob/master/src/XML/SignedElementTrait.php:
What stands out is that the signature is being calculated over the canonical version of the SignedInfo-tree. The validateReference method, however, uses the original non-canonicalized version of SignedInfo.
Impact
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 potentially be possible to forge the signature. No possibilities to exploit this were found during the investigation.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | simplesamlphp/saml2 | >= 5.0.0-alpha.12, < 5.0.0-alpha.13 | 5.0.0-alpha.13 |
| Paquete de Composer | simplesamlphp/xml-security | >= 1.6.11, < 1.6.12 | 1.6.12 |
Referencias
- https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-ww7x-3gxh-qm6r
- https://nvd.nist.gov/vuln/detail/CVE-2023-49087
- https://github.com/simplesamlphp/xml-security/commit/f509e3083dd7870cce5880c804b5122317287581
- https://github.com/simplesamlphp/xml-security
- https://github.com/simplesamlphp/xml-security/blob/master/src/XML/SignedElementTrait.php
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Debilidad (CWE)
CWE-345- Plataforma
- Composer
- Paquete
simplesamlphp/saml2, simplesamlphp/xml-security- Publicada
- 28.11.2023
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-ww7x-3gxh-qm6r - CC BY 4.0
Historial de vulnerabilidades: simplesamlphp/xml-security
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 2
- Primera → última
- 11.2023 03.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Alta 2
Divulgaciones por año
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 1
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Validation of SignedInfo esta entrada
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