CVE-2024-8305 in Server
Summary
by MITRE • 10/21/2024
prepareUnique index may cause secondaries to crash due to incorrect enforcement of index constraints on secondaries, where in extreme cases may cause multiple secondaries crashing leading to no primaries. This issue affects MongoDB Server v6.0 versions prior to 6.0.17, MongoDB Server v7.0 versions prior to 7.0.13 and MongoDB Server v7.3 versions prior to 7.3.4
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Analysis
by VulDB Data Team • 11/08/2024
The vulnerability identified as CVE-2024-8305 represents a critical flaw in MongoDB Server implementations that affects database consistency and availability across multiple version streams. This issue specifically targets the prepareUnique index functionality within MongoDB's replication architecture, where incorrect enforcement of index constraints on secondary nodes creates a cascading failure condition. The vulnerability manifests when secondary members in a replica set attempt to process unique index operations, leading to potential system crashes that can propagate through the replication topology. The flaw exists in MongoDB Server versions 6.0 prior to 6.0.17, 7.0 prior to 7.0.13, and 7.3 prior to 7.3.4, indicating a widespread impact across the MongoDB ecosystem. This vulnerability directly impacts the reliability of MongoDB deployments that utilize replica sets, where the failure of secondary nodes can severely compromise database availability and consistency guarantees.
The technical root cause of this vulnerability stems from improper validation mechanisms within MongoDB's index constraint enforcement on secondary nodes during replication operations. When a prepareUnique index operation is processed on a secondary member, the system fails to correctly validate index constraints, leading to scenarios where the secondary node becomes unstable and may crash. This behavior occurs because the secondary node does not properly maintain consistency with the primary's index state during concurrent operations. The flaw is particularly dangerous in environments where multiple secondaries are present, as the crash of one secondary can trigger cascading failures that ultimately result in the complete loss of primary node functionality. This represents a violation of fundamental database consistency principles and can be classified under CWE-691, which addresses inadequate protection against infinite loops or excessive resource consumption. The improper enforcement of index constraints on secondaries creates a condition where the replication protocol fails to maintain proper state synchronization, leading to system instability.
The operational impact of CVE-2024-8305 extends beyond simple service disruption to threaten the fundamental availability and integrity of MongoDB deployments. In extreme cases, the vulnerability can cause multiple secondary nodes to crash simultaneously, effectively removing all secondary members from the replica set and leaving the primary node as the sole operational member. This scenario creates a critical availability risk where the database loses its redundancy and fault tolerance capabilities, making it vulnerable to complete service outages. The vulnerability affects production environments that rely on MongoDB's replication features, potentially leading to data unavailability, service degradation, and business continuity issues. Organizations running MongoDB versions within the affected ranges face significant risk of operational disruption, particularly those with complex replication topologies that depend on multiple secondary nodes for high availability. The impact is further amplified by the fact that this vulnerability can be exploited through normal database operations, making it particularly insidious and difficult to detect or prevent without proper patching.
The recommended mitigation strategy for CVE-2024-8305 involves immediate patching of affected MongoDB Server versions to the specified secure releases. Organizations should prioritize updating their MongoDB deployments to versions 6.0.17, 7.0.13, or 7.3.4 depending on their current version stream, as these releases contain the necessary fixes for the index constraint enforcement issue. System administrators should conduct thorough testing of patched environments to ensure compatibility and stability before full deployment. Additionally, organizations should implement monitoring solutions to detect potential secondary node failures and establish automated alerting for replication anomalies. The vulnerability's impact aligns with ATT&CK technique T1484.001, which addresses privilege escalation through manipulation of replication protocols, and T1499.004, which covers service interruption through database corruption or instability. Security teams should also consider implementing network segmentation and access controls to limit exposure of MongoDB instances to potential exploitation, while maintaining regular vulnerability assessments to identify similar issues within their MongoDB deployments.