Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS01Zm05LWg3MjgtZndwas4AAzpS

trust-dns vulnerable to Remote Attackers causing Denial-of-Service (packet loops) with crafted DNS packets

trust-dns and trust-dns-server are vulnerable to remotely triggered denial-of-service attacks, consuming both network and CPU resources.
DNS messages with the QR=1 bit set are responded to with a FormErr response.
This allows creating a traffic loop, in which these FormErr responses are sent nonstop between vulnerable servers.

There are two scenarios how this can be exploited: 1) Create a loop between two instances of trust-dns, consuming network resources, or 2) consuming the CPU of a single instance.

With two instances A and B an attacker sends a DNS query with a spoofed source IP address to A.
A replies with a FormErr to B.
Now both servers with ping-pong the message back and forth until by chance the packet is dropped in the network.
Multiple spoofed packets can be sent by the attacker, increasing resource consumption.

A single server can get locked up replying to itself.
Same setup as above, but now A sends the reply to itself.
The packet is sent out as fast as the CPU and network stack manage.
This locks up a CPU core.
Multiple packets from the attacker consume multiple CPU cores.

Permalink: https://github.com/advisories/GHSA-5fm9-h728-fwpj
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS01Zm05LWg3MjgtZndwas4AAzpS
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 11 months ago
Updated: 11 months ago

Identifiers: GHSA-5fm9-h728-fwpj
References:

• https://github.com/bluejekyll/trust-dns/pull/1952
• https://rustsec.org/advisories/RUSTSEC-2023-0041.html
• https://github.com/advisories/GHSA-5fm9-h728-fwpj

Repository: https://github.com/bluejekyll/trust-dns
Blast Radius: 0.0

Affected Packages