Description
ASTEVAL is an evaluator of Python expressions and statements. Prior to 1.0.9, FROM_PY in asteval/astutils.py exposes BaseException, SystemExit, KeyboardInterrupt, and GeneratorExit to expressions evaluated by asteval.Interpreter.eval(), while run() and eval() in asteval/asteval.py catch Exception rather than these non-Exception BaseException subclasses. When an attacker-controlled expression raises one of these classes, on_raise() passes the class to raise_exception(), and the resulting exception bypasses the interpreter's safety handlers and propagates into the calling application. A consuming service that evaluates untrusted expressions can therefore be terminated or have signal and cleanup handling disrupted, causing denial of service. The separately documented read-only open() capability is not part of this vulnerability. This issue is fixed in version 1.0.9.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
lmfit asteval
< 1.0.9affected
References
- https://github.com/lmfit/asteval/security/advisories/GHSA-89v8-rhwq-hf77 ↗
- https://github.com/lmfit/asteval/pull/153 ↗
- https://github.com/lmfit/asteval/commit/9c625b3674f8d05f206708bb85afca17a87694a4 ↗
- https://github.com/lmfit/asteval/commit/c49c99a67acb63eb7410231932250bd820380e45 ↗
- https://github.com/lmfit/asteval/releases/tag/1.0.9 ↗