Remote code execution via traversed DTD cache path
Published Sep 2, 2021 · Updated Aug 4, 2024
XXE in Eclipse Theia 0.1.1 through 0.2.0 allows attackers to execute code through the default XML extension and malicious XML. The bundled outdated lsp4xml server retrieves an external DTD and accepts traversal segments in its cache path, writing the DTD outside ~/.lsp4xml/cache/. The attack requires Theia to open attacker-controlled XML, after which files can be written into the service user's home directory and executed.
Summary
What happened
XXE in Eclipse Theia 0.1.1 through 0.2.0 allows attackers to execute code through the default XML extension and malicious XML. The bundled outdated lsp4xml server retrieves an external DTD and accepts traversal segments in its cache path, writing the DTD outside ~/.lsp4xml/cache/. The attack requires Theia to open attacker-controlled XML, after which files can be written into the service user's home directory and executed.
The record
- CVE
- CVE-2021-34436
- Published
- Sep 2, 2021
- Updated
- Aug 4, 2024
- Vendor
- The Eclipse Foundation
- Product
- Eclipse Theia
- Classifications
- CWE-22, CWE-611, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 2, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=0.1.1
- Affected versionversion=0.1.2
- Affected versionversion=0.2.0-next.28bc2735
- Affected versionversion=0.2.0-next.41406d98
- Affected versionversion=0.2.0-next.a2958907
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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