HistoryEdit

RUSTSEC-2020-0001

Stack overflow when resolving additional records from MX or SRV null targets

Issued
Package
trust-dns-server (crates.io)
Type
Vulnerability
Categories
Keywords
#stack-overflow #crash
Aliases
Details
https://github.com/bluejekyll/trust-dns/issues/980
CVSS Score
7.5 HIGH
CVSS Details
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Patched
  • >=0.18.1
Unaffected
  • <0.16.0

Description

There's a stack overflow leading to a crash and potential DOS when processing additional records for return of MX or SRV record types from the server.

This is only possible when a zone is configured with a null target for MX or SRV records, i.e. '.'.

Example effected zone record:

no-service 86400 IN MX 0 .

Prior to 0.16.0 the additional record processing was not supported by trust-dns-server. There Are no known issues with upgrading from 0.16 or 0.17 to 0.18.1. The remidy should be to upgrade to 0.18.1. If unable to do so, MX, SRV or other record types with a target to the null type, should be avoided.