CVE-2020-5290 session fixation in rCTF
Attackers can hijack victim sessions via token fixation, allowing them to steal flags and gain points by forcing victims into attacker-controlled accounts.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-5290?
CVE-2020-5290 is a medium-severity authentication bypass vulnerability in redpwn rctf, published on 1 Apr 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
In RedpwnCTF before version 2.3, there is a session fixation vulnerability in exploitable through the `#token=$ssid` hash when making a request to the `/verify` endpoint. An attacker team could potentially steal flags by, for example, exploiting a stored XSS payload in a CTF challenge so that victim teams who solve the challenge are unknowingly (and against their will) signed into the attacker team's account. Then, the attacker can gain points / value off the backs of the victims. This is patched in version 2.3.
Weakness: CWE-384
Which versions are affected by CVE-2020-5290?
It affects 1 product.
Products include Ctfd Rctf.
How do I fix CVE-2020-5290?
No fix has been published for CVE-2020-5290 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-2020-5290 being exploited?
There is no known exploitation of CVE-2020-5290 in the wild and no public exploit code.