CVE-2023-7216 is a path traversal vulnerability found in the GNU CPIO utility. This vulnerability allows a remote unauthenticated attacker to trick a user into opening a specially crafted archive. During the extraction process, the archiver could follow symlinks outside of the intended directory. This could allow files to be written in arbitrary directories through symlinks, which poses significant risks to affected systems.
The severity of this vulnerability is classified as medium, with a CVSS score of 5.3. This score indicates a moderate level of risk due to its potential for exploitation. Organizations using affected systems should be aware of the real-world implications this vulnerability may have on their operations.
Currently, there is no public exploit confirmed for this vulnerability, which suggests that it may not be widely targeted at this time. However, due to its nature, organizations should prioritize patching immediately to prevent any potential exploitation.
Risk to organizations includes unauthorized file access and potential system compromise if the vulnerability is exploited. As a proactive measure, it is essential for organizations to schedule remediation and ensure that their systems are updated to the latest versions to mitigate this risk.
Vulnerability Details
The official description of the vulnerability states: 'A path traversal vulnerability was found in the CPIO utility. This issue could allow a remote unauthenticated attacker to trick a user into opening a specially crafted archive. During the extraction process, the archiver could follow symlinks outside of the intended directory, which allows files to be written in arbitrary directories through symlinks.'
This vulnerability falls under the CWE classifications of CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-59 (Improper Link Resolution). The CVSS score of 5.3 indicates that it has a medium severity level, with a low attack complexity and no privileges required for exploitation.
Technical Analysis
The root cause of the vulnerability lies in how the CPIO utility handles symlinks during the extraction of archives. Attackers may craft an archive that, when extracted, can lead the archiver to follow symlinks that point to unexpected locations. This misconfiguration allows for arbitrary file writes, which can critically compromise the integrity of the host system.
The attack vector is local, meaning that an attacker would need to have some local access to the user’s system, typically by tricking the user into opening a malicious archive. User interaction is required, and the attack complexity is considered low, making it relatively easy for an attacker to exploit this vulnerability if the user is not cautious.
Risk & Impact Analysis
The real-world deployment risk of this vulnerability is significant. If exploited, an attacker could potentially gain unauthorized access to sensitive files or even execute arbitrary commands on the affected system. The blast radius for this vulnerability could extend to any system where the CPIO utility is used, particularly in environments that process untrusted archive files.
Organizations should assess their exposure to this vulnerability based on their deployment of the CPIO utility and take immediate action to mitigate risks. Prioritizing remediation is critical, especially given the potential for exploitation in environments that may inadvertently process malicious archives.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects the following versions of the GNU CPIO and Red Hat Enterprise Linux:
1. GNU CPIO (all versions) 2. Red Hat Enterprise Linux 7.0 3. Red Hat Enterprise Linux 8.0 4. Red Hat Enterprise Linux 9.0 If version information is missing, organizations should consider all versions prior to vendor patch.
Mitigation & Remediation
Organizations should ensure they are using the latest patched versions of the CPIO utility. It is recommended to regularly check for updates from the vendor, especially from Red Hat, and apply any available patches as they become available. In the absence of a patch, consider implementing configuration hardening to restrict the use of CPIO to trusted archives only.
For more comprehensive security, organizations may validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor log indicators for unusual extraction activities, particularly involving symlinks. Behavioral anomalies during archive handling should be flagged for further investigation, and network signatures associated with CPIO should be analyzed for unauthorized access attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-7216 lies in its representation of vulnerabilities that can be exploited through social engineering tactics. As attackers increasingly rely on user mistakes, this vulnerability highlights the need for robust user training. Security teams should emphasize the importance of verifying archive contents before extraction and implement strict policies around file handling.
For organizations looking to bolster their security posture, resources such as the API penetration testing guide and penetration testing methodology can provide insights into best practices for securing applications.
Organizations should also consider engaging in vulnerability management programs to systematically address and remediate vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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