CVE-2019-9747 Denial of service in n/a
A malicious mDNS packet causes an infinite loop in the tinysvcmdns library, hanging the server; the project is unmaintained and deprecated.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-9747?
CVE-2019-9747 is a high-severity denial of service vulnerability in n/a, published on 13 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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."
Weakness: CWE-835
Which versions are affected by CVE-2019-9747?
It affects 1 product.
Products include Tinysvcmdns Project Tinysvcmdns.
How do I fix CVE-2019-9747?
No fix has been published for CVE-2019-9747 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-9747 being exploited?
There is no known exploitation of CVE-2019-9747 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-6729-2hp6-xxx8.