CVE-2024-0760
Published: 23 July 2024
Summary
CVE-2024-0760 is a high-severity Allocation of Resources Without Limits or Throttling (CWE-770) vulnerability. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 4.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2024-0760 is a resource exhaustion vulnerability in ISC BIND 9 that allows a remote attacker to destabilize the DNS server by sending a large volume of DNS messages over TCP. The affected versions are 9.18.1 through 9.18.27, 9.19.0 through 9.19.24, and the corresponding subscription editions 9.18.11-S1 through 9.18.27-S1. The flaw is tracked under CWE-770 and carries a CVSS 3.1 score of 7.5 due to its high impact on availability.
An unauthenticated remote attacker can exploit the issue simply by establishing TCP connections and flooding the server with DNS queries. During the attack the server becomes unstable, though it may recover once the traffic stops; network ACLs provide no protection because the messages are processed after the TCP handshake.
ISC advisory information at kb.isc.org and the oss-security postings state that ACLs will not mitigate the attack and direct operators to apply the fixes released in later maintenance versions of BIND 9. The EPSS score has remained near 0.17 with only minor fluctuation between its current and peak values, indicating no significant post-disclosure surge in observed exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-16548
Vulnerability details
A malicious client can send many DNS messages over TCP, potentially causing the server to become unstable while the attack is in progress. The server may recover after the attack ceases. Use of ACLs will not mitigate the attack. This…
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issue affects BIND 9 versions 9.18.1 through 9.18.27, 9.19.0 through 9.19.24, and 9.18.11-S1 through 9.18.27-S1.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control implements explicit throttling on session allocation, addressing the weakness of allocating resources without limits.
Plan testing exercises resource allocation limits and throttling during simulated failures, directly addressing weaknesses that allow unbounded resource use.
Contingency plan updates ensure recovery strategies address unbounded resource allocation, making it harder for attackers to exploit lack of throttling to cause prolonged outages.
Provides continuity when unbounded resource allocation at the primary site leads to exhaustion and downtime.
Alternate services allow operations to continue when primary allocation of resources lacks limits or throttling.
Explicit planning of security-related actions requires defining limits, windows, and resource allocations, making allocation without throttling far less likely.
Measures of performance include tracking allocation behavior and throttling effectiveness, reducing the window for resource exhaustion attacks.
Imposes an inactivity-based limit on network resource allocation, throttling the number of concurrently held connections.