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CVE-2025-24359

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Date: January 24, 2025

ASTEVAL is an evaluator of Python expressions and statements. Prior to version 1.0.6, if an attacker can control the input to the "asteval" library, they can bypass asteval's restrictions and execute arbitrary Python code in the context of the application using the library. The vulnerability is rooted in how "asteval" performs handling of "FormattedValue" AST nodes. In particular, the "on_formattedvalue" value uses the dangerous format method of the str class. The code allows an attacker to manipulate the value of the string used in the dangerous call "fmt.format(__fstring__=val)". This vulnerability can be exploited to access protected attributes by intentionally triggering an "AttributeError" exception. The attacker can then catch the exception and use its "obj" attribute to gain arbitrary access to sensitive or protected object properties. Version 1.0.6 fixes this issue.

Severity Score

Severity Score

Weakness Type (CWE)

Exposed Dangerous Method or Function

CWE-749

Use of Externally-Controlled Format String

CWE-134

Top Fix

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Upgrade Version

Upgrade to version asteval - 1.0.6

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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