CVE-2021-43999 Improper validation of SAML responses
Attackers can assume other users' identities via improper SAML validation if SAML support is enabled in Apache Guacamole.
- 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-2021-43999?
CVE-2021-43999 is a high-severity authentication bypass vulnerability in Apache Guacamole, published on 11 Jan 2022. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Apache Guacamole 1.2.0 and 1.3.0 do not properly validate responses received from a SAML identity provider. If SAML support is enabled, this may allow a malicious user to assume the identity of another Guacamole user.
Weakness: CWE-287
Which versions are affected by CVE-2021-43999?
2 open source packages ship an affected version, including guacamole and guacamole-server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
guacamole Bitnami | From 1.2.0 to 1.2.0 | None |
guacamole-server Bitnami | From 1.2.0 to 1.2.0 | None |
Products include Apache Guacamole.
How do I fix CVE-2021-43999?
No fix has been published for CVE-2021-43999 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-2021-43999 being exploited?
There is no known exploitation of CVE-2021-43999 in the wild and no public exploit code.
Other vulnerabilities in Apache Guacamole
- CVE-2017-3158 Apache Guacamole Race Condition vulnerability
- CVE-2023-43826 Apache Guacamole: Integer overflow in handling of VNC image buffers
- CVE-2019-19603 Null dereference in n/a
- CVE-2018-1340 Missing Encryption of Sensitive Data in Apache Guacamole
- CVE-2024-35164 Apache Guacamole: Improper input validation of console codes
Sources
Also known as BIT-guacamole-2021-43999, BIT-guacamole-server-2021-43999, GHSA-v83c-8hcj-4545, UBUNTU-CVE-2021-43999.