Vulnerability in Ctfd Rctf
CVE-2020-5290
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.008 (55.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Ctfd Rctf
- Redpwn Rctf — versions < 2.3
Weakness classification (CWE)
References
- github.com/redpwn/rctf/security/advisories/GHSA-p5fh-2vhw-fvpq (Exploit, Third Party Advisory)
- github.com/redpwn/rctf/issues/147 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-5290?
- CVE-2020-5290 is a medium-severity vulnerability in Ctfd Rctf, classified under Session Fixation. CVSS score: 6.5/10. Published 2020-04-01.
- How severe is CVE-2020-5290?
- Medium severity. CVSS v3 base score is 6.5 out of 10.