An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.
CVSS Details
- CVSS 3.1 Base Score: 5.9
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade dnsdist | Jul 30, 2024 | Sep 11, 2018 |
| Freebsd | — | Upgrade dnsdist | Aug 23, 2017 | Aug 22, 2017 |
| Suse | — | Upgrade libluajit-5_1-2-32bitUpgrade libluajit-5_1-2Upgrade dnsdistUpgrade luajitUpgrade luajit-devel | Aug 9, 2024 | Sep 11, 2018 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Sep 11, 2018 |
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