What Is Python-Asteval?
ASTEVAL is a Python library designed for safe(ish) evaluation of mathematical expressions, leveraging Python’s ast module. It provides a restricted execution environment for user-input math operations, often integrating NumPy functions for enhanced capabilities.
Why Is CVE-2025-24359 Critical?
Threat: Maliciously crafted format strings can bypass security, leading to arbitrary code execution.
Impact: Attackers may escape the sandbox, compromising system integrity.
Severity: Rated high-risk (Red Hat Bugzilla #2341976).
Did You Know? Format string vulnerabilities have historically enabled memory corruption exploits—similar to infamous CVEs like CVE-2000-0847 (Wu-Ftpd).
Patch & Update Instructions
Affected Systems
Fedora 42 (python-asteval v1.0.5-3 and earlier).
How to Fix
Terminal Command:
su -c 'dnf upgrade --advisory FEDORA-2025-83c141f000'
Manual Update:
Fetch the latest python-asteval-1.0.6-1 via Fedora repositories.
Technical Deep Dive: CVE-2025-24359
Root Cause
The exploit arises from improper input sanitization in ASTEVAL’s string formatting, allowing attackers to inject malicious payloads.
Mitigation Strategies
Input Validation: Restrict user-supplied format strings.
Sandbox Hardening: Use seccomp or Linux namespaces for isolation.
Change Log & References
Recent Updates
2025-07-09 – v1.0.6-1: Patched CVE-2025-24359 (RH#2341976).
2025-06-03 – v1.0.5-3: Python 3.14 compatibility.
Official Sources
FAQ: Python-Asteval Security
❓ Is this vulnerability exploitable remotely?
→ Only if the attacker has local access or via a compromised web app using ASTEVAL.
❓ Does this affect other Linux distros?
→ Currently confirmed only in Fedora 42, but check your package manager for updates.
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