CVE-2023-2828 is a high-severity vulnerability affecting ISC BIND, a widely used DNS server software. The vulnerability arises from the cache-cleaning algorithm utilized by the 'named' instance configured to run as a recursive resolver. When the cache database, which stores responses to recent queries, reaches a specified threshold, the algorithm is supposed to clean up expired entries. However, it has been discovered that certain query patterns can severely reduce the effectiveness of this algorithm, allowing the cache to exceed its configured size limit. This could potentially lead to service disruptions or outages.
The CVSS score for CVE-2023-2828 is 7.5, categorizing it as high severity. This indicates a significant risk to organizations utilizing affected versions of BIND, which include versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, and 9.19.0 through 9.19.13, among others.
The risk to organizations includes potential denial of service conditions due to excessive memory usage, which could be exploited by attackers. As such, organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability.
There are known public exploits available for this vulnerability, which increases the urgency for defenders to address it in their systems.
Vulnerability Details
The vulnerability allows an attacker to manipulate the cache-cleaning behavior of the BIND server, effectively allowing the cache size to exceed the configured limit. This can lead to increased memory usage and potential service failures.
Affected products include ISC BIND versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, and 9.19.0 through 9.19.13. The vulnerability has been officially documented and a patch is available for remediation.
Technical Analysis
The root cause of this vulnerability lies in the algorithm responsible for cleaning up the cache database in BIND. When a specific sequence of queries is sent to the resolver, the algorithm fails to effectively manage the cache size, allowing it to overflow the configured limits.
The attack vector is network-based with low complexity. No privileges are required for an attacker to exploit this vulnerability, and user interaction is not necessary. The impact on availability is rated as high, meaning that the service could become unavailable under certain conditions.
Risk & Impact Analysis
Organizations that rely on ISC BIND for DNS services face significant risks due to this vulnerability. The potential for denial of service attacks and memory overflow issues demonstrates how critical it is to maintain effective cache management. This could have a broad impact on service availability, affecting not just DNS resolution but potentially other services dependent on DNS.
With a CVSS score of 7.5, organizations must assess their exposure and prioritize remediation efforts in their patch cycles. The urgency is elevated due to the availability of public exploits which attackers may leverage.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of ISC BIND are affected by CVE-2023-2828: 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, and 9.19.0 through 9.19.13. Organizations using these versions should take immediate action to apply patches or updates.
Mitigation & Remediation
To mitigate the risks associated with CVE-2023-2828, organizations are advised to upgrade to the latest versions of ISC BIND. The latest patches effectively address the cache-cleaning algorithm issue, ensuring that memory management operates within the configured limits.
Organizations may also consider implementing additional network controls and monitoring to detect unusual query patterns that may indicate attempts to exploit this vulnerability.
For comprehensive security assessments, organizations can utilize our penetration testing services to identify and remediate similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of cache-related anomalies, such as unexpected spikes in memory usage or unusual query patterns. Behavioral analysis could highlight potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-2828 highlights the importance of robust memory management in DNS services. This vulnerability represents a pattern of failing to properly enforce resource limits in widely used software, which can lead to severe service disruptions.
Security teams should take this opportunity to evaluate their cache management strategies and implement more stringent controls to prevent similar vulnerabilities in the future.
For further reading on vulnerability management and prevention strategies, consider our resources on vulnerability management programs and best practices in penetration testing that can enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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