CVE-2023-6780 is a medium-severity vulnerability affecting the glibc library, specifically the __vsyslog_internal function. This vulnerability allows for an integer overflow when the syslog or vsyslog functions are invoked with overly long messages. The overflow leads to incorrect buffer size calculations, resulting in undefined behavior. This issue impacts glibc version 2.37 and newer.
The CVSS score for this vulnerability is 5.3, indicating a medium severity level. The attack vector is network-based, and the complexity is low, meaning that an attacker could exploit this vulnerability without needing special privileges or user interaction. The potential risk to organizations includes service interruptions due to availability impacts.
Given the nature of the vulnerability and its potential impact, organizations should address this issue in their priority patch cycle. Immediate attention is recommended for systems running affected versions of glibc.
Currently, there are no known exploits or public proof-of-concept code associated with this vulnerability, which suggests that it has not been actively targeted in the wild. However, the low complexity of exploitation warrants caution.
Vulnerability Details
The official CVE description highlights the integer overflow found in the __vsyslog_internal function of the glibc library, specifically when handling long messages. This vulnerability affects glibc 2.37 and newer versions. The associated CWE classifications include CWE-131 and CWE-190, which pertain to improper handling of buffer sizes and integer overflow respectively.
The CVSS vector for this vulnerability is defined as CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L, reflecting a low complexity, no privileges required, and no user interaction needed for execution. The availability impact is noted as low, indicating that while the impact may not be severe, it still poses a risk to service continuity.
Technical Analysis
The root cause of CVE-2023-6780 is an integer overflow in the __vsyslog_internal function of the glibc library. This occurs when the syslog and vsyslog functions receive excessively long messages, leading to an incorrect buffer size calculation. The attack vector is network-based, allowing attackers to potentially exploit this vulnerability remotely.
Given the low attack complexity, an attacker does not require special privileges or user interaction to exploit this vulnerability. The impact on confidentiality and integrity is noted as none, while the availability impact is low, meaning that the service may experience disruptions, but not complete outages.
Risk & Impact Analysis
Organizations using affected versions of glibc should consider the real-world deployment risk associated with CVE-2023-6780. The potential for service interruptions, even if low, necessitates that this vulnerability be addressed as part of an organization's patch management strategy.
The blast radius for this vulnerability is significant, given that glibc is a core library used by many applications and services. Therefore, any exploitation could potentially affect a wide range of systems and services. Organizations should prioritize remediation based on the CVSS score, as the medium severity indicates that it should be addressed promptly.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The versions affected by CVE-2023-6780 include glibc versions 2.37 to 2.39 and Fedora versions 38 and 39. Organizations should ensure that they are running patched versions to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching glibc to the latest available version. If an immediate patch is not available, consider implementing workarounds such as limiting message lengths in syslog and vsyslog calls. Configuration hardening measures should be applied to reduce the attack surface, and network controls should be implemented to monitor for potential exploit attempts.
For further validation of remediation effectiveness, organizations should engage in continuous penetration testing to identify any similar weaknesses.
Detection Guidance
Monitoring logs for unusual syslog activity can help in detecting potential exploitation attempts. Behavioral anomalies, such as unexpected service crashes or abnormal message lengths, should also be monitored. Network signatures can be employed to identify malicious traffic patterns associated with this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2023-6780 underscores the importance of robust input validation in software libraries, particularly those as fundamental as glibc. The integer overflow vulnerability highlights the potential for even low-severity issues to disrupt services in critical environments.
Security teams should regularly review and update their libraries and dependencies to mitigate such vulnerabilities proactively. Engaging in practices like routine penetration testing methodologies can help identify weaknesses before they are exploited.
Adopting a comprehensive vulnerability management program will ensure that organizations are prepared for future vulnerabilities and incidents.
Furthermore, this vulnerability exemplifies the necessity of engaging in proactive security testing to mitigate risks associated with dependencies and libraries.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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