漏洞信息
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Vulnerability Title
Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encrypted_assertion accepts an EncryptedAssertion whose decrypted content carries no signature
Vulnerability Description
Net::SAML2 versions before 0.86 for Perl allow authentication bypass because _verify_encrypted_assertion accepts an EncryptedAssertion whose decrypted content carries no signature.
_verify_encrypted_assertion decrypts the EncryptedAssertion and returns it as verified when it carries no signature, via "return $xml unless $xpath->exists('dsig:Signature', $assert);". The signature check and the trust anchor check that follow run only when a signature is present, so a decrypted assertion with no dsig:Signature element reaches new_from_xml unverified and its NameID and attributes are read into the assertion object. An SP's encryption certificate is published in its SAML metadata so the IdP can encrypt to it, so any party can encrypt an unsigned assertion to that certificate, wrap it in a samlp:Response, and post it to the assertion consumer service.
Any caller that configures a decryption key_file, and so accepts EncryptedAssertions, takes identity fields from an assertion that no trust anchor covers, and an unauthenticated party can authenticate as an arbitrary user. Callers with no key_file configured do not decrypt and are unaffected.
CVSS Information
N/A
Vulnerability Type
密码学签名的验证不恰当
Vulnerability Title
TIMLEGGE Net::SAML2 加密问题漏洞
Vulnerability Description
timlegge Net::SAML2是timlegge个人开发者的一款实现SAML2协议的Perl库。 TIMLEGGE Net::SAML2 0.86之前版本存在加密问题漏洞,该漏洞源于_verify_encrypted_assertion接受解密后无签名的EncryptedAssertion,可能导致身份验证绕过,使未认证攻击者能够以任意用户身份进行认证。
CVSS Information
N/A
Vulnerability Type
N/A