CVE-2022-42919 represents a high-severity vulnerability affecting Python 3.9.x prior to 3.9.16 and 3.10.x prior to 3.10.9 on Linux systems. This vulnerability allows local privilege escalation in non-default configurations. Such configurations can lead to serious risks as they allow pickles to be deserialized from any user in the same machine local network namespace. In many system setups, this means any user on the same machine can potentially exploit this vulnerability.
The Python multiprocessing library, when leveraged with the forkserver start method on Linux, can execute arbitrary code through pickles. Attackers may leverage this capability to escalate their privileges locally. As a result, there is an urgent need for organizations to address this vulnerability immediately.
Organizations should prioritize patching immediately. The workaround for this vulnerability involves setting the 'multiprocessing.util.abstract_sockets_supported' configuration to False. However, the forkserver start method for multiprocessing is not the default method, meaning not all users will be affected unless they have specifically configured their systems in this way.
This vulnerability is Linux specific, as it relies on features unique to the Linux operating system. CPython versions prior to 3.9 do not utilize Linux abstract namespace sockets by default, which adds another layer of complexity for potential exploitation.
Organizations utilizing affected Python versions should take immediate action to mitigate the risk posed by this vulnerability.
Vulnerability Details
Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. This vulnerability allows for local user privilege escalation.
The severity of this vulnerability is classified as high, with a CVSS score of 7.8. The attack vector is local, with low complexity, requiring low privileges, and no user interaction. The impact on confidentiality, integrity, and availability is all classified as high.
The vulnerability is specific to Python versions and configurations on Linux, particularly affecting users running Python with the forkserver method.
Technical Analysis
The root cause of CVE-2022-42919 lies in the use of the Python multiprocessing library with the forkserver start method. This method allows for the deserialization of pickles from any user, which can lead to the execution of arbitrary code. Since pickles can execute any code in the context of the user that the forkserver process runs as, this creates a significant risk for privilege escalation.
The attack vector is classified as local, meaning that an attacker must have local access to the machine. The complexity of the attack is low, as it does not require sophisticated techniques or extensive privileges to exploit. Privileges required for exploitation are low, making it accessible to many potential attackers.
User interaction is not required for the exploitation of this vulnerability, which increases the risk as it allows attackers to exploit it without any action from the legitimate user.
The impacts include high potential damage to confidentiality, integrity, and availability. Organizations should be aware that this vulnerability can lead to unauthorized access and control over systems, which can have severe consequences.
Risk & Impact Analysis
Risk to organizations includes the potential for local privilege escalation, allowing attackers to execute arbitrary code under the privileges of the affected Python processes. The blast radius can be significant, as any user on the same local network namespace may exploit this vulnerability, resulting in unauthorized access to sensitive data and system controls.
Organizations need to assess the urgency of addressing this vulnerability based on their deployment of Python versions and configurations. Given the high severity and potential impact, organizations should prioritize patching immediately.
Failure to address this vulnerability could expose systems to local attacks that could lead to extensive damage, including data breaches and loss of control over affected systems.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux, as well as Fedora versions 35, 36, and 37.
Mitigation & Remediation
Organizations should patch their installations of Python to the latest versions as soon as possible. The following updates should be applied: Python 3.9.16 or later and Python 3.10.9 or later. Additionally, if immediate patching is not possible, set the 'multiprocessing.util.abstract_sockets_supported' configuration to False as a temporary workaround.
For further assistance and to ensure comprehensive security testing, organizations can consider engaging in penetration testing to identify similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unusual activity related to the multiprocessing library. Behavioral anomalies that indicate unauthorized access attempts should be flagged. Additionally, network signatures may help identify attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-42919 is notable, as it indicates vulnerabilities in widely used libraries, such as Python, that can lead to local privilege escalation. This highlights the importance of maintaining up-to-date software and configurations, especially in environments where multiple users may interact with the same system.
Security teams should consider this vulnerability as part of their broader threat modeling and risk assessment strategies. The trends it represents emphasize the need for vigilance against local attacks that exploit misconfigurations and vulnerabilities.
To strengthen defenses, organizations can refer to best practices outlined in our resources, including penetration testing methodology, and vulnerability management program design to mitigate similar risks.
Overall, CVE-2022-42919 serves as a critical reminder of the importance of security in software development and deployment practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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