# CVE-2020-14383: ctdb: A flaw was found in samba's DNS server

CVE-2020-14383 is fixed in 18 products on 1 platform, first by ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.21, released October 28, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-14383
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0221
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2020

## Description

A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ctdb Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ctdb-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | ctdb Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [ctdb 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ctdb-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | libnss-winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [libnss-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | libnss-winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [libnss-winbind 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss-winbind-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | libpam-winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [libpam-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpam-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | libpam-winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [libpam-winbind 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libpam-winbind-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | libparse-pidl-perl Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [libparse-pidl-perl 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libparse-pidl-perl-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | libsmbclient Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [libsmbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libsmbclient-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | libsmbclient Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [libsmbclient 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libsmbclient-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | libwbclient0 Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [libwbclient0 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libwbclient0-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | libwbclient0 Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [libwbclient0 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libwbclient0-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | python-samba Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [python-samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-samba-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | python3-samba Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [python3-samba 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-samba-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | registry-tools Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [registry-tools 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-registry-tools-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | registry-tools Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [registry-tools 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-registry-tools-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-common Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-common 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-common-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-common Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-common 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-common-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-common-bin Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-common-bin 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-common-bin-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-common-bin Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-common-bin 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-common-bin-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-dsdb-modules Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-dsdb-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-dsdb-modules-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-dsdb-modules Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-dsdb-modules 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-dsdb-modules-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-libs Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-libs 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-libs-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-libs Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-libs 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-libs-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-testsuite Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-testsuite 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-testsuite-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-testsuite Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-testsuite 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-testsuite-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | samba-vfs-modules Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [samba-vfs-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-vfs-modules-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | samba-vfs-modules Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [samba-vfs-modules 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-vfs-modules-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | smbclient Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [smbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-smbclient-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | smbclient Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [smbclient 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-smbclient-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |
| Linux | winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | [winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.21](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.21.md) | Oct 28, 2020 |
| Linux | winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.6 | [winbind 2:4.11.6+dfsg-0ubuntu1.6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-winbind-2-4.11.6-dfsg-0ubuntu1.6.md) | Oct 28, 2020 |

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