Vulnerability · Published Oct 16, 2023 · Assigned by GitHub_M
CVE-2023-45683Cross site scripting via missing binding syntax validation In ACS location in github.com/crewjam/saml
High 7.1
In plain English
A high-severity cross-site scripting in saml from crewjam. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
github.com/crewjam/saml is a saml library for the go language. In affected versions the package does not validate the ACS Location URI according to the SAML binding being parsed. If abused, this flaw allows attackers to register malicious Service Providers at the IdP and inject Javascript in the ACS endpoint definition, achieving Cross-Site-Scripting (XSS) in the IdP context during the redirection at the end of a SAML SSO Flow. Consequently, an attacker may perform any authenticated action as the victim once the victim’s browser loaded the SAML IdP initiated SSO link for the malicious service provider. Note: SP registration is commonly an unrestricted operation in IdPs, hence not requiring particular permissions or publicly accessible to ease the IdP interoperability. This issue is fixed in version 0.4.14. Users unable to upgrade may perform external validation of URLs provided in SAML metadata, or restrict the ability for end-users to upload arbitrary metadata.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/crewjam/saml | 0.4.14 | GHSA-267v-3v32-g6q5 |
| Go | github.com/crewjam/saml | 0.4.14 | GO-2023-2114 |
| Ubuntu:22.04:LTS | golang-github-crewjam-saml | no fix listed | UBUNTU-CVE-2023-45683 |
| Ubuntu:24.04:LTS | golang-github-crewjam-saml | no fix listed | UBUNTU-CVE-2023-45683 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L