An off-by-one heap-based buffer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a message bigger than INT_MAX bytes, leading to an incorrect calculation of the buffer size to store the message, resulting in an application crash. This issue affects glibc 2.37 and newer.
The CVSS score for this vulnerability is 8.2, indicating a high severity level. The impact on organizations can be significant, particularly in environments where the glibc library is widely used, as it can lead to application downtime and potential data loss.
Organizations should prioritize patching immediately to address this vulnerability. The availability of exploits or proofs of concept has not been confirmed, but the nature of the vulnerability poses a noteworthy risk.
The urgency for defenders is underscored by the vulnerability's potential to disrupt service and compromise application stability.
Vulnerability Details
This vulnerability allows for a heap-based buffer overflow due to improper handling of input size in the __vsyslog_internal function. The affected product, glibc, is critical for many applications running on Fedora systems, particularly those that rely on logging functionality.
The CVSS score of 8.2 indicates a high severity, with a low attack complexity and no privileges required for exploitation. The vulnerability affects versions 2.37 and newer of glibc.
The vulnerability was published on January 31, 2024, and is classified under CWE-122 and CWE-787.
Technical Analysis
The root cause of this vulnerability stems from an off-by-one error in buffer size calculation in the glibc library. The attack vector is over the network, and the attack complexity is low, meaning that the vulnerability can be exploited without significant effort. There are no privileges required for exploitation, and user interaction is not necessary.
The confidentiality impact is rated as none, while the integrity impact is low and the availability impact is high, indicating that successful exploitation could lead to application crashes and service disruptions.
Risk & Impact Analysis
Risk to organizations includes significant downtime and data loss due to application crashes. The blast radius could extend to all applications relying on the glibc library, especially in enterprise environments where logging is critical.
Organizations should assess their deployment of affected versions and take the necessary steps to remediate this vulnerability as part of their priority patch cycle.
Given the high CVSS score and the potential for exploitation, this vulnerability deserves immediate attention in terms of risk management and mitigation strategies.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include glibc 2.37 through 2.39 and Fedora 38 and 39. Organizations using these versions should take immediate action to patch their systems.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest patches provided by the vendor. For systems running vulnerable versions of glibc, it is recommended to upgrade to version 2.39 or later.
If patching is not immediately possible, consider implementing network controls to limit exposure to the affected services. Organizations should also monitor their systems for unusual behavior indicative of exploitation attempts.
Additional guidance on effective remediation strategies can be found through resources such as penetration testing services.
Detection Guidance
Organizations should monitor logs for any anomalies related to syslog or vsyslog function calls and track any crashes associated with applications using glibc. Behavioral anomalies in network traffic that indicate potential exploitation attempts should also be analyzed.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the critical importance of secure coding practices in library development. It represents a trend towards increased scrutiny in input validation and buffer management.
Security teams should focus on implementing robust logging mechanisms and conducting regular security assessments to uncover similar vulnerabilities. For further reading on security practices, consider exploring penetration testing methodology and vulnerability management program design to strengthen security postures.
In conclusion, the identification of CVE-2023-6779 serves as a reminder for continuous monitoring of dependencies and the importance of adopting a proactive security stance.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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