CVE-2025-4435 is a high-severity vulnerability found in the TarFile module of Python, which affects the correct functioning of file extraction when using a specific error level setting. This vulnerability allows unintentional extraction of files that should be filtered out, posing a significant risk to data integrity in applications that rely on this functionality. With a CVSS score of 7.5, organizations should take immediate action to address this issue.
The vulnerability arises when the TarFile.errorlevel is set to 0, which is intended to skip filtered members during extraction. However, the actual behavior in affected versions results in the extraction of these filtered files, contrary to the documented behavior. This discrepancy can lead to unintended data exposure, increasing the risk of sensitive information being compromised.
Currently, there is no known exploit for this vulnerability, but the potential for exploitation remains high due to its nature. Organizations must prioritize patching to mitigate this risk and protect their data integrity.
Given the potential impact and high severity of CVE-2025-4435, organizations should schedule remediation as part of their priority patch cycle. It is crucial to stay informed about any updates regarding this vulnerability and implement necessary patches once available.
Vulnerability Details
This vulnerability allows unintended file extraction when using the TarFile.errorlevel = 0 setting. The expected behavior is to skip filtered members, but the actual behavior leads to these members being extracted. The vulnerability is categorized under CWE-682, which pertains to incorrect behavior of software.
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector is network-based with low attack complexity and does not require any privileges or user interaction. The potential impact on integrity is high, while confidentiality and availability impacts are not applicable.
The vulnerability was published on June 3, 2025, and remains under analysis. Organizations using affected versions of the TarFile module should be aware of this issue and monitor for any updates from the Python community for remediation.
Technical Analysis
The root cause of CVE-2025-4435 lies in the TarFile module's handling of error levels during extraction. When the error level is set to 0, the expectation is that any filtered members would not be extracted. However, the flawed implementation allows these members to be extracted, leading to potential data leaks.
The attack vector for this vulnerability is network-based, meaning an attacker could exploit it remotely if they can manipulate the extraction process. The attack complexity is low, as no special conditions are required to trigger the vulnerability. Additionally, no user interaction or privileges are needed for exploitation.
The impact on integrity is high, as unauthorized access to extracted files can compromise the integrity of the data. However, there is no impact on confidentiality or availability, making this vulnerability particularly concerning for applications that handle sensitive data.
Risk & Impact Analysis
The risks associated with CVE-2025-4435 are substantial, particularly for organizations that utilize the TarFile module for file extraction. The unintentional extraction of filtered files increases the risk of sensitive information exposure, which can lead to severe consequences, including data breaches and regulatory penalties.
Organizations should assess their deployment of the TarFile module and evaluate the potential blast radius of this vulnerability. Given its high-severity rating, the urgency for patching should be classified as high. Organizations are advised to address this vulnerability in their priority patch cycle to mitigate risks effectively.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, specific affected versions of the TarFile module have not been identified. Organizations are advised to assume that all versions prior to the upcoming vendor patch are vulnerable and should monitor for updates regarding this issue.
Mitigation & Remediation
Organizations should prioritize patching this vulnerability as soon as a fix is available. In the meantime, they can implement workarounds by adjusting the error level settings or applying filters more cautiously. Additionally, enhancing monitoring and logging for file extraction processes can help detect any unauthorized extractions.
For further assistance, organizations may consider engaging in penetration testing to validate their remediation efforts.
Detection Guidance
Organizations should monitor logs for any anomalies related to file extractions. Key indicators include unusual file access patterns, unexpected file sizes, and extraction attempts of filtered members. Implementing network signatures that detect unauthorized data flows during extraction can also enhance security.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-4435 emphasizes the importance of robust validation in file handling modules. This vulnerability represents a trend towards increased scrutiny of data integrity in software. Security teams should consider implementing comprehensive testing practices to identify similar vulnerabilities in their codebases.
For best practices in vulnerability management, organizations can refer to our vulnerability management program. Additionally, adopting a proactive approach in code reviews can help in identifying potential vulnerabilities before they are exploited.
In conclusion, maintaining a secure environment requires ongoing vigilance. Organizations should prepare for future vulnerabilities by engaging in penetration testing methodology to ensure their defenses are robust against emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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