SAML authentication bypass vulnerability in RobotsAndPencils/go-saml

RobotsAndPencils go-saml, a SAML client library written in Go, contains an authentication bypass vulnerability in all known versions. This is due to how the `xmlsec1` command line tool is called internally to verify the signature of SAML assertions. When `xmlsec1` is used without defining the enabled key data, the origin of the public key for the signature verification is, unfortunately, not restricted. That means an attacker can sign the SAML assertions themselves and provide the required public key (e.g. an RSA key) directly embedded in the SAML token. Projects still using RobotsAndPencils/go-saml should move to another SAML library or alternatively remove support for SAML from their projects. The vulnerability can likely temporarily be fixed by forking the go-saml project and adding the command line argument `--enabled-key-data` and specifying a value such as `x509` or `raw-x509-cert` when calling the `xmlsec1` binary in the verify function. Please note that this workaround must be carefully tested before it can be used.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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go-saml 安全漏洞

go-saml是Robots and Pencils开源的一个用 Go 编写的足够好的 SAML 客户端库。 RobotsAndPencils go-saml 存在安全漏洞，该漏洞源于应用包含 SAML身份验证绕过漏洞，可能会导致使用 go-saml 进行 SAML 断言签名验证的应用程序身份验证绕过。

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