CVE-2022-1586 is a critical out-of-bounds read vulnerability discovered in the PCRE2 library. Specifically, the issue arises in the compile_xclass_matchingpath() function of the pcre2_jit_compile.c file. This vulnerability allows attackers to exploit a unicode property matching issue in JIT-compiled regular expressions.
The vulnerability is rated with a CVSS score of 9.1, categorizing it as critical. The high severity indicates a significant risk to organizations, especially since it can be exploited remotely without requiring any user interaction.
Risk to organizations includes potential unauthorized access to sensitive data due to the high confidentiality impact. Additionally, it may lead to denial of service through high availability impact.
Organizations should prioritize patching immediately to mitigate this vulnerability and prevent any potential exploitation.
Vulnerability Details
The vulnerability allows for an out-of-bounds read within the PCRE2 library due to a unicode property matching issue in JIT-compiled regular expressions. The official CVE description states this issue occurs because the character was not fully read in case-less matching within JIT.
The CVSS score of 9.1 indicates a critical severity, characterized by a low attack complexity and no privileges required for exploitation. The attack vector is network-based, and the vulnerability affects confidentiality with a high impact and availability with a high impact.
Affected products include the PCRE2 library, various Linux distributions such as Debian and Fedora, and specific NetApp storage solutions.
Technical Analysis
The root cause of this vulnerability stems from a programming error in the PCRE2 library's handling of unicode properties in JIT-compiled regular expressions. The improper reading of characters leads to potential out-of-bounds memory access.
The attack vector is network-based, meaning attackers can exploit this vulnerability remotely. The complexity of the attack is low, and no user interaction is needed for successful exploitation.
The privilege requirement is non-existent, making this vulnerability particularly dangerous as it can be exploited by unauthenticated attackers.
The impact on confidentiality is high, as sensitive data could be exposed. Integrity is not impacted, but the availability of the affected systems may also be compromised, further increasing the risk to organizations.
Risk & Impact Analysis
The real-world deployment risk for CVE-2022-1586 is significant due to the widespread use of the PCRE2 library in various applications, particularly in regex processing. Organizations using affected products should be aware of the potential for unauthorized access and data breach.
This vulnerability can have a broad blast radius, affecting multiple systems across different environments. Organizations must assess their exposure based on product usage and implement necessary mitigations.
Given the CVSS score of 9.1 and the absence of any known exploit, organizations should address this vulnerability in the priority patch cycle to minimize risk.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions are affected by CVE-2022-1586:
All versions of PCRE2 prior to 10.40, as well as specific versions of Fedora (35 and 36), Red Hat Enterprise Linux (8.0 and 9.0), and various NetApp products are vulnerable.
Mitigation & Remediation
Organizations must apply the latest patches for affected products to mitigate this vulnerability. Ensure that updates for the PCRE2 library are up-to-date, especially for systems running Debian or Fedora.
If a patch is not immediately available, consider implementing network controls to limit access to affected services and monitor for unusual activity.
To further enhance security, organizations should conduct regular security assessments and consider engaging in penetration testing to identify similar weaknesses.
Detection Guidance
Monitor logs for any indicators of exploitation attempts related to regex processing in applications utilizing PCRE2. Look for unusual patterns or anomalies that may signify an attack.
Behavioral anomalies in applications that utilize the PCRE2 library should be investigated. Additionally, ensure that network signatures are in place to detect any malicious traffic attempting to exploit this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-1586 underscores the importance of robust validation in software libraries. Regular updates and security assessments are crucial for maintaining the integrity of systems that rely on external libraries like PCRE2.
This vulnerability represents a pattern of similar issues found in libraries that handle complex data structures and user inputs. Organizations should implement stringent testing and validation processes to minimize risks associated with third-party libraries.
For organizations relying on PCRE2, it is essential to stay informed about security updates and engage in proactive security measures such as penetration testing to identify potential vulnerabilities.
Engaging in a comprehensive security strategy that includes continuous monitoring and incident response planning can significantly enhance an organization's defensive posture against threats like CVE-2022-1586.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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