CVE-2020-5290

session fixation in rCTF

MEDIUM
6.5
CVSS Score
Published: April 1, 2020 at 07:25 PM UTC
Updated: June 17, 2026 at 03:21 AM UTC
2 products affected across 2 vendorsRctfRctf

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 2.3
Affected range stops below 2.3, so it looks safe — our inference, not a vendor statement
v < 2.3
Affected range stops below 2.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_MISCExploitThird Party Advisory
https://github.com/redpwn/rctf/issues/147

CVSS

6.5MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-384

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