Description
An issue was discovered in adns before 1.5.2. It fails to ignore apparent answers before the first RR that was found the first time. when this is fixed, the second answer scan finds the same RRs at the first. Otherwise, adns can be confused by interleaving answers for the CNAME target, with the CNAME itself. In that case the answer data structure (on the heap) can be overrun. With this fixed, it prefers to look only at the answer RRs which come after the CNAME, which is at least arguably correct.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | adns | 1.6.0-2 | — |
| Debian 13 | adns | 1.6.0-2 | — |
| Debian 12 | adns | 1.6.0-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | adns | No fix yet | — |
| Ubuntu 18.04 LTS | adns | No fix yet | — |
| Ubuntu 16.04 LTS | adns | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES 12 SP4 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES 12 SP3 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES 12 SP2 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES 11 SP4 | adns | 1.4-75.3.1 | SUSE-SU-2020:14399-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES for SAP 12 SP4 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES for SAP 12 SP3 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SLES for SAP 12 SP2 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SUSE OpenStack Cloud Crowbar 8 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SUSE OpenStack Cloud 8 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SUSE OpenStack Cloud 7 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | adns | 1.4-75.3.1 | SUSE-SU-2020:14399-1 |
| SUSE HPE Helion OpenStack 8 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
| SUSE Enterprise Storage 5 | adns | 1.4-103.3.1 | SUSE-SU-2020:1612-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | adns | 1.5.1-lp151.3.3.1 | openSUSE-SU-2020:0827-1 |
Advisories 3
- SUSE-SU-2020:14399-1 Security update for adns SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0827-1 Security update for adns SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1612-1 Security update for adns SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git
- openSUSE-SU-2020:0827 vendor-advisory
- https://www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html
- http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git%3Ba=blob%3Bf=changelog
- FEDORA-2020-530188bf36 vendor-advisory
- FEDORA-2020-e59bcaf702 vendor-advisory