CVE-2018-7340 Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
Attackers can bypass SAML authentication by manipulating XML data without invalidating signatures, potentially gaining unauthorized access to service providers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2018-7340?
CVE-2018-7340 is a high-severity authentication bypass vulnerability in Duo Network Gateway, published on 17 Apr 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Which versions are affected by CVE-2018-7340?
It affects 1 product.
Products include Cisco Duo Network Gateway.
How do I fix CVE-2018-7340?
No fix has been published for CVE-2018-7340 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-2018-7340 being exploited?
There is no known exploitation of CVE-2018-7340 in the wild and no public exploit code.
Other vulnerabilities in Duo Network Gateway
Sources
Also known as GHSA-39gm-mmxq-4x9r.