Authenticated connection redirection via Unicode length mismatch
Published Jun 7, 2023 · Updated Oct 10, 2024
Protocol injection in Apache Guacamole 1.5.1 and earlier allows remote authenticated users to redirect server-initiated connections. The Java client counts supplementary Unicode characters as two UTF-16 code units while the C parser expects one code point, letting a crafted image-type parameter terminate its element and inject a connect instruction. Low-privileged web access is required; the injected instruction can replace the legitimate connection destination and parameters.
Summary
What happened
Protocol injection in Apache Guacamole 1.5.1 and earlier allows remote authenticated users to redirect server-initiated connections. The Java client counts supplementary Unicode characters as two UTF-16 code units while the C parser expects one code point, letting a crafted image-type parameter terminate its element and inject a connect instruction. Low-privileged web access is required; the injected instruction can replace the legitimate connection destination and parameters.
The record
- CVE
- CVE-2023-30575
- Published
- Jun 7, 2023
- Updated
- Oct 10, 2024
- Vendor
- The Apache Software Foundation
- Product
- Apache Guacamole
- Classifications
- CWE-131, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 7, 2023CVE publishedPublication date reported by the CVE source.
- Oct 10, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.5.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Guacamole protocol-injection demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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