GHSA-5fm9-h728-fwpj – trust-dns-server

Package

Manager: cargo
Name: trust-dns-server
Vulnerable Version: >=0 <0.22.1 || >=0.23.0-alpha.2 <0.23.0-alpha.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:U/RC:R

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS: N/A pctlN/A

Details

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.

Metadata

Created: 2023-06-06T02:06:23Z
Modified: 2023-06-06T02:06:23Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-5fm9-h728-fwpj/GHSA-5fm9-h728-fwpj.json
CWE IDs: []
Alternative ID: N/A
Finding: F002
Auto approve: 1