xml-security is a library that implements XML signatures and encryption. Prior to versions 2.3.1 and 1.13.9, XML nodes encrypted with either aes-128-gcm, aes-192-gcm, or aes-256-gcm lack validation of the authentication tag length. An attacker can use this to brute-force an authentication tag, recover the GHASH key, and decrypt the encrypted nodes.
It also allows to forge arbitrary ciphertexts without knowing the encryption key. This vulnerability is fixed in 2.3.1 and 1.13.9.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Simplesamlphp Xml-Security
cpe:2.3:a:simplesamlphp:xml-security:*:*:*:*:*:*:*:*
|
— |
1.13.9
|
|
Simplesamlphp Xml-Security
cpe:2.3:a:simplesamlphp:xml-security:*:*:*:*:*:*:*:*
|
2.0.0
|
2.3.1
|
References 3
https://github.com/simplesamlphp/xml-security/commit/cad6d57cf0a5a0b7e0cc4e4a5b…
security-advisories@github.com
https://github.com/simplesamlphp/xml-security/commit/fdc12449e959c610943f9fd428…
security-advisories@github.com
https://github.com/simplesamlphp/xml-security/security/advisories/GHSA-r353-484…
security-advisories@github.com