CVE-2020-9498 Memory corruption in Apache Guacamole
A malicious RDP server can trigger memory corruption in Apache Guacamole, potentially allowing arbitrary code execution on the guacd process.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-9498?
CVE-2020-9498 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 2 Jul 2020. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Apache Guacamole 1.1.0 and older may mishandle pointers involved inprocessing data received via RDP static virtual channels. If a userconnects to a malicious or compromised RDP server, a series ofspecially-crafted PDUs could result in memory corruption, possiblyallowing arbitrary code to be executed with the privileges of therunning guacd process.
Weakness: CWE-787
Which versions are affected by CVE-2020-9498?
2 open source packages ship an affected version, including guacamole and guacamole-server. It affects 3 products.
| Package | Affected | Fixed in |
|---|---|---|
guacamole Bitnami | All versions | 1.1.0 |
guacamole-server Bitnami | All versions | 1.1.0 |
Products include Apache Guacamole, Debian Debian Linux, Fedoraproject Fedora.
How do I fix CVE-2020-9498?
Upgrade guacamole to 1.1.0 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-9498 being exploited?
There is no known exploitation of CVE-2020-9498 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
- CVE-2021-43999 Improper validation of SAML responses
- 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
Sources
Also known as BIT-guacamole-2020-9498, BIT-guacamole-server-2020-9498, DEBIAN-CVE-2020-9498, GHSA-wrfm-qjwf-qpwj, UBUNTU-CVE-2020-9498.