CVE-2019-9747: tinysvcmdns_project tinysvcmdns Infinite Loop

Vulnerability summary

CVE-2019-9747 is a high (CVSS 7.5) Infinite Loop vulnerability in tinysvcmdns_project tinysvcmdns. EPSS estimates a 1.39% chance of exploitation in the next 30 days, higher than 71.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 13-03-2019
   PublishedVulnerability first disclosed.
2. 16-09-2024
   Last modifiedVulnerability information updated.

Description

In tinysvcmdns through 2018-01-16, a maliciously crafted mDNS (Multicast DNS) packet triggers an infinite loop while parsing an mDNS query. When mDNS compressed labels point to each other, the function uncompress_nlabel goes into an infinite loop trying to analyze the packet with an mDNS query. As a result, the mDNS server hangs after receiving the malicious mDNS packet. NOTE: the product's web site states "This project is un-maintained, and has been since 2013. ... There are known vulnerabilities ... You are advised to NOT use this library for any new projects / products."

• CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.