CVE-2023-48703 SAML authentication bypass vulnerability in RobotsAndPencils/go-saml
Attackers can bypass SAML authentication by embedding their own public key in assertions, allowing unauthorized access to applications using this Go library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-48703?
CVE-2023-48703 is a high-severity authentication bypass vulnerability in RobotsAndPencils go-saml, published on 6 Mar 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2023-48703?
3 open source packages ship an affected version, including github.com/RobotsAndPencils/go-saml. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/RobotsAndPencils/go-saml Go | All versions | None |
github.com/RobotsAndPencils/go-saml Go | All versions to 0.0.0-20230606195814-29020529affc | None |
github.com/RobotsAndPencils/go-saml Go | All versions to 0.0.0-20230606195814-29020529affc | None |
Products include Robotsandpencils Go-Saml.
How do I fix CVE-2023-48703?
No fix has been published for CVE-2023-48703 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-48703 being exploited?
There is no known exploitation of CVE-2023-48703 in the wild and no public exploit code.
Other vulnerabilities in RobotsAndPencils go-saml
Sources
Also known as GHSA-6h53-q94j-348w, GO-2024-3048.