CyberRota Analysis
AI-GeneratedThe vulnerability affects the ASTEVAL library, specifically prior to version 1.0.9, where certain non-Exception subclasses of BaseException can be raised during the evaluation of untrusted Python expressions. This can lead to denial of service by allowing an attacker to disrupt the calling application's signal and cleanup handling. Organizations using ASTEVAL to evaluate untrusted expressions should prioritize updating to version 1.0.9 to mitigate this risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD 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.