CVE-2021-20202 Temporary Directory Hijacking Vulnerability in Keycloak
Attackers can access or modify Keycloak temporary files by pre-creating directories with wider permissions, compromising data confidentiality and integrity.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-20202?
CVE-2021-20202 is a high-severity vulnerability in Redhat Keycloak, published on 12 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in keycloak. Directories can be created prior to the Java process creating them in the temporary directory, but with wider user permissions, allowing the attacker to have access to the contents that keycloak stores in this directory. The highest threat from this vulnerability is to data confidentiality and integrity.
Weakness: CWE-377
Which versions are affected by CVE-2021-20202?
2 open source packages ship an affected version, including org.keycloak:keycloak-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-core Maven | All versions | 13.0.0 |
org.keycloak:keycloak-core Maven | All versions | 13.0.0 |
Products include Redhat Keycloak.
How do I fix CVE-2021-20202?
Upgrade org.keycloak:keycloak-core to 13.0.0 or later.
Is CVE-2021-20202 being exploited?
There is no known exploitation of CVE-2021-20202 in the wild and no public exploit code.
Other vulnerabilities in Redhat Keycloak
- CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC
- CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature
- CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability
- CVE-2019-14910 Keycloak Authentication Error
- CVE-2019-14909 Keycloak Authentication Error
Sources
Also known as GHSA-6xp6-fmc8-pmmr.