CVE-2023-41105 is a high-severity vulnerability affecting Python versions 3.11.0 through 3.11.4. This issue occurs when a path containing '\0' bytes is passed to the os.path.normpath() function, resulting in unexpected truncation of the path at the first '\0' byte. Previously, in Python 3.10.x or earlier, such filenames would have been rejected for security reasons, but this safeguard is no longer in place in Python 3.11.x. Consequently, applications may inadvertently accept filenames that should be considered unsafe.
The severity of this vulnerability is classified as high, with a CVSS score of 7.5. This rating highlights the potential for attackers to exploit this issue through network vectors, as it requires no privileges or user interaction. The integrity impact is rated as high, indicating that successful exploitation could compromise the integrity of files managed by affected applications.
Organizations using Python 3.11.x should take immediate action to address this vulnerability, as it poses a significant risk to their systems. The vulnerability is particularly concerning for applications that handle file paths, where unexpected behavior could lead to unauthorized data manipulation or access.
As of now, there are no known public exploits for this vulnerability, but the potential for exploitation exists given the nature of the flaw. Organizations should prioritize patching to the latest version to mitigate this vulnerability.
Vulnerability Details
The official description states: 'An issue was discovered in Python 3.11 through 3.11.4. If a path containing '\0' bytes is passed to os.path.normpath(), the path will be truncated unexpectedly at the first '\0' byte. There are plausible cases in which an application would have rejected a filename for security reasons in Python 3.10.x or earlier, but that filename is no longer rejected in Python 3.11.x.' This vulnerability is classified under CWE-426.
The CVSS score is 7.5, indicating a high severity level, with the following characteristics:
Metric | Value |
|---|---|
Attack Vector | NETWORK |
Attack Complexity | LOW |
Privileges Required | NONE |
User Interaction | NONE |
Integrity Impact | HIGH |
The affected products include Python and NetApp's Active IQ Unified Manager.
Technical Analysis
This vulnerability arises from the handling of file paths in Python's os.path.normpath() function. When a path with null bytes is provided, the function truncates the input at the first null byte, leading to potential integrity issues when applications attempt to process such paths. The attack vector is network-based, and the complexity is low since no special privileges or user interactions are required.
From a technical perspective, this vulnerability can be exploited by sending specially crafted requests to applications using the affected Python version, potentially leading to unauthorized access or modification of files.
Risk & Impact Analysis
Organizations utilizing Python 3.11.x must understand the implications of this vulnerability. If exploited, attackers could manipulate file paths, leading to unauthorized data access or corruption. This could have significant repercussions, particularly for applications that rely on the integrity of file systems.
The urgency for remediation is high, given the potential for exploitation without user interaction and the low complexity required for an attack. Organizations should prioritize patching to mitigate risks effectively.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Python versions 3.11.0 to 3.11.4, as well as NetApp's Active IQ Unified Manager. Organizations should ensure they are using patched versions to mitigate risks associated with this vulnerability.
Mitigation & Remediation
To mitigate the risks associated with CVE-2023-41105, organizations should prioritize upgrading to the latest version of Python, which addresses this vulnerability. Specifically, upgrading to version 3.11.5 or later is recommended. If immediate patching is not feasible, organizations should implement appropriate workarounds to validate file paths, ensuring that any paths passed to os.path.normpath() do not include null bytes.
For further guidance, organizations may consider engaging in penetration testing to identify potential vulnerabilities related to file path handling.
Detection Guidance
Monitoring for this vulnerability should include logging any instances of file path handling, specifically focusing on paths that may contain null bytes. Additionally, organizations should look for behavioral anomalies in applications that utilize file paths, which could indicate attempts to exploit this vulnerability. System logs should be reviewed regularly for any unusual file access patterns or integrity issues.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-41105 lies in its representation of how critical file path handling is in programming languages. The fact that a seemingly minor change can lead to significant vulnerabilities underscores the importance of rigorous security assessments during software updates.
This incident serves as a reminder for security teams to implement thorough testing and validation processes for file handling functions. As developers increasingly rely on libraries and frameworks, understanding the implications of updates is crucial for maintaining application security.
Organizations should also consider adopting continuous security practices to identify vulnerabilities proactively. For further insights on application security, organizations can refer to the following resources: penetration testing methodology and vulnerability management program design to enhance their security posture.
Known Exploitation Timeline
As of now, there are no indications that CVE-2023-41105 has been actively exploited in the wild, but organizations should remain vigilant and monitor for any updates regarding this vulnerability.
EPSS Risk Context
The EPSS score for CVE-2023-41105 is 0.0036, placing it in the 58th percentile. This indicates a relatively low probability of exploitation in the near term, but organizations should not dismiss the potential risks associated with this vulnerability.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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