# CVE-2020-10704: ctdb: A flaw was found when using samba as an Active Directory Domain Controller

CVE-2020-10704 is fixed in 18 products on 1 platform, first by ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.16, released April 27, 2020. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-10704
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0354
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 27, 2020

## Description

A flaw was found when using samba as an Active Directory Domain Controller. Due to the way samba handles certain requests as an Active Directory Domain Controller LDAP server, an unauthorized user can cause a stack overflow leading to a denial of service. The highest threat from this vulnerability is to system availability. This issue affects all samba versions before 4.10.15, before 4.11.8 and before 4.12.2.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ctdb Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [ctdb 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ctdb-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | ctdb Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [ctdb 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-ctdb-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | libnss-winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [libnss-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnss-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | libnss-winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [libnss-winbind 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnss-winbind-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | libpam-winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [libpam-winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libpam-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | libpam-winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [libpam-winbind 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libpam-winbind-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | libparse-pidl-perl Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [libparse-pidl-perl 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libparse-pidl-perl-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | libsmbclient Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [libsmbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libsmbclient-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | libsmbclient Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [libsmbclient 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libsmbclient-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | libwbclient0 Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [libwbclient0 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libwbclient0-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | libwbclient0 Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [libwbclient0 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libwbclient0-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | python-samba Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [python-samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-python-samba-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | python3-samba Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [python3-samba 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-python3-samba-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | registry-tools Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [registry-tools 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-registry-tools-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | registry-tools Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [registry-tools 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-registry-tools-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-common Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-common 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-common-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-common Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-common 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-common-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-common-bin Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-common-bin 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-common-bin-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-common-bin Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-common-bin 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-common-bin-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-dsdb-modules Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-dsdb-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-dsdb-modules-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-dsdb-modules Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-dsdb-modules 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-dsdb-modules-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-libs Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-libs 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-libs-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-libs Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-libs 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-libs-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-testsuite Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-testsuite 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-testsuite-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-testsuite Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-testsuite 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-testsuite-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | samba-vfs-modules Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [samba-vfs-modules 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-samba-vfs-modules-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | samba-vfs-modules Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [samba-vfs-modules 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-samba-vfs-modules-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | smbclient Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [smbclient 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-smbclient-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | smbclient Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [smbclient 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-smbclient-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |
| Linux | winbind Ubuntu 18.04.6 LTS (bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | [winbind 2:4.7.6+dfsg~ubuntu-0ubuntu2.16](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-winbind-2-4.7.6-dfsg-ubuntu-0ubuntu2.16.md) | Apr 27, 2020 |
| Linux | winbind Ubuntu 20.04 LTS (focal) | 2:4.11.6+dfsg-0ubuntu1.1 | [winbind 2:4.11.6+dfsg-0ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-winbind-2-4.11.6-dfsg-0ubuntu1.1.md) | Apr 27, 2020 |

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