Improper input validation in Apache Guacamole
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Apache Guacamole 1.1.0 and older do not properly validate datareceived from RDP servers via static virtual channels. If a userconnects to a malicious or compromised RDP server, specially-craftedPDUs could result in disclosure of information within the memory ofthe guacd process handling the connection.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | Apache Guacamole | Apache Guacamole 1.1.0 and older | — | No fix listed | CNA |
- Apache Guacamole Vendor— Affected Apache Guacamole 1.1.0 and older Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:* | up to 1.1.0 | Vulnerable | Apache |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
- cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:* Versions up to 1.1.0 Vulnerable ·Apache
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Apache Guacamole — FEDORA-2020-bfde0ab889
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2020-07607 Out-of-bounds write in Apache GuacamolePriority LOW 31
- Advisory ·
Apache Guacamole — FEDORA-2020-640645e518
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2020-07607 Out-of-bounds write in Apache GuacamolePriority LOW 31
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-9497
- 2026-10-03 Alias added: GHSA-9q4f-696q-fjxm
References
Advisory 6
- https://lists.apache.org/thread.html/r65f75d3d65d1af68141f42071ebb27dda24af3e45570e593c1dbd81f%40%3Cannounce.guacamole.apache.org%3E
- https://research.checkpoint.com/2020/apache-guacamole-rce/
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44525
- [debian-lts-announce] 20201106 [SECURITY] [DLA 2435-1] guacamole-server security update
- FEDORA-2020-bfde0ab889
- FEDORA-2020-640645e518
Other 5
- [announce] 20200701 [SECURITY] CVE-2020-9497: Apache Guacamole: Improper input validation of RDP static virtual channels
- [guacamole-user] 20200703 Re: [SECURITY] CVE-2020-9497: Apache Guacamole: Improper input validation of RDP static virtual channels
- [guacamole-user] 20200703 RE: [SECURITY] CVE-2020-9497: Apache Guacamole: Improper input validation of RDP static virtual channels
- [announce] 20210125 Apache Software Foundation Security Report: 2020
- [announce] 20210223 Re: Apache Software Foundation Security Report: 2020
Sources
- CVE-2020-9497 · CVE Program
- CVE-2020-9497 · NVD
- FIRST EPSS
- GHSA-9q4f-696q-fjxm · GitHub Advisory Database · CC BY 4.0
- CVE-2020-9497 · Red Hat security data · CC BY 4.0
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