PT-2020-17489 · Trust Dns · Trust-Dns-Server

Published 2020-01-06 · Updated 2023-12-07 · CVE-2020-35857

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions trust-dns-server versions prior to 0.18.1

Description An issue was discovered in the trust-dns-server crate, where DNS MX and SRV null targets are mishandled, causing stack consumption. This can lead to a stack overflow, resulting in a crash and potential denial of service (DOS) when processing additional records for return of MX or SRV record types from the server. The issue is only possible when a zone is configured with a null target for MX or SRV records.

Recommendations To resolve the issue, upgrade to version 0.18.1. If unable to do so, avoid using MX, SRV, or other record types with a target to the null type to minimize the risk of exploitation.

Exploit

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2020-35857

GHSA-4CWW-F7W5-X525

RUSTSEC-2020-0001

Affected Products

Trust-Dns-Server

References · 13

• 🔥 https://rustsec.org/advisories/RUSTSEC-2020-0001.html · Exploit
• https://osv.dev/vulnerability/GHSA-4cww-f7w5-x525 · Vendor Advisory
• https://osv.dev/vulnerability/RUSTSEC-2020-0001 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-35857 · Security Note
• https://osv.dev/vulnerability/CVE-2020-35857 · Vendor Advisory
• https://github.com/bluejekyll/trust-dns/commit/8b9eab05795fdc098976262853b2498055c7a8f3 · Note
• https://github.com/bluejekyll/trust-dns/pull/982 · Note
• https://github.com/bluejekyll/trust-dns/issues/980 · Note
• https://github.com/bluejekyll/trust-dns · Note
• https://crates.io/crates/trust-dns-server · Note
• https://t.me/cibsecurity/21453 · Telegram Post
• https://t.me/cvenotify/62832 · Telegram Post
• https://t.me/cvenotify/8006 · Telegram Post