CVE-2017-18106 Auth bypass in Crowd
Remote attackers can hijack user sessions by exploiting identifier hash collisions in Atlassian Crowd, leading to unauthorized access.
- 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-2017-18106?
CVE-2017-18106 is a high-severity authentication bypass vulnerability in Atlassian Crowd, published on 29 Mar 2019. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The identifier_hash for a session token in Atlassian Crowd before version 2.9.1 could potentially collide with an identifier_hash for another user or a user in a different directory, this allows remote attackers who can authenticate to Crowd or an application using Crowd for authentication to gain access to another user's session provided they can make their identifier hash collide with another user's session identifier hash.
Weakness: CWE-287
Which versions are affected by CVE-2017-18106?
It affects 1 product.
Products include Atlassian Crowd.
How do I fix CVE-2017-18106?
No fix has been published for CVE-2017-18106 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-2017-18106 being exploited?
There is no known exploitation of CVE-2017-18106 in the wild and no public exploit code.
Other vulnerabilities in Atlassian Crowd
Sources
Also known as GHSA-4vj3-9qjv-52hq.