Sandbox escape via unchecked ExceptionGroup split result
Published Jan 23, 2025 · Updated Feb 12, 2025
Sandbox escape in Zope Foundation RestrictedPython 6.0 through 7.4 allows remote authenticated users to execute unrestricted Python code. CPython's _PyEval_ExceptionGroupMatch calls an attacker-controlled ExceptionGroup.split method, then relies on release-disabled assertions before treating its return value as a tuple. Exploitation requires permission to submit RestrictedPython code containing try/except* on CPython 3.11 through 3.13.1 and enables an arbitrary memory write outside the restricted execution policy.
Summary
What happened
Sandbox escape in Zope Foundation RestrictedPython 6.0 through 7.4 allows remote authenticated users to execute unrestricted Python code. CPython's _PyEval_ExceptionGroupMatch calls an attacker-controlled ExceptionGroup.split method, then relies on release-disabled assertions before treating its return value as a tuple. Exploitation requires permission to submit RestrictedPython code containing try/except* on CPython 3.11 through 3.13.1 and enables an arbitrary memory write outside the restricted execution policy.
The record
- CVE
- CVE-2025-22153
- Published
- Jan 23, 2025
- Updated
- Feb 12, 2025
- Vendor
- Zope Foundation
- Product
- RestrictedPython
- Classifications
- CWE-843, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 23, 2025CVE publishedPublication date reported by the CVE source.
- Feb 12, 2025Record 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=>= 6.0, < 8.0
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
- try_except_star_bug.pyproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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