Overview
The CVE-2025-24294 is a significant cybersecurity vulnerability that affects systems using the resolv library for DNS packet processing. It allows potential attackers to cause a Denial of Service (DoS) condition by exploiting an insufficient check on the length of a decompressed domain name within a DNS packet. This vulnerability poses a significant threat to system availability and may lead to potential system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-24294
Severity: High (CVSS 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise, and data leakage
Affected Products
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Product | Affected Versions
Resolv Library | All previous versions up to latest
How the Exploit Works
An attacker with knowledge of this vulnerability can craft a malicious DNS packet with a highly compressed domain name. When the resolv library on the affected system receives and parses this packet, it attempts to decompress the domain name without checking the final length. This operation consumes a large amount of CPU resources, causing the application thread to become unresponsive, resulting in a Denial of Service condition.
Conceptual Example Code
The following is a conceptual representation of the attack using a pseudocode:
def craft_malicious_packet():
domain_name = "a" * 1000000 # Highly compressed domain name
dns_packet = DNSPacket() # Pseudocode for creating a DNS packet
dns_packet.add_compressed_name(domain_name)
return dns_packet
malicious_packet = craft_malicious_packet()
send_to_target(malicious_packet, target_IP)In the above pseudocode, `craft_malicious_packet` function creates a DNS packet with a highly compressed domain name that is added to the `dns_packet` object. The `send_to_target` function then sends this malicious packet to the target system, causing the DoS condition.
Mitigation Guidance
Affected users are advised to apply the vendor patch as soon as it becomes available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation to filter out malicious DNS packets.
