CVE-2020-10704 Denial of service in samba
An unauthorized user can cause a stack overflow and denial of service in Samba when configured as an Active Directory Domain Controller.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-10704?
CVE-2020-10704 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 6 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-674
Which versions are affected by CVE-2020-10704?
It affects 4 products.
Linux distribution packages (10)
samba SUSE:Enterprise Storage 6 | All versions | 4.9.5+git.317.6d82fb3918b-3.35.1 |
samba SUSE:Linux Enterprise High Availability Extension 15 | All versions | 4.7.11+git.231.7f324c4d89e-4.40.1 |
samba SUSE:Linux Enterprise High Availability Extension 15 SP1 | All versions | 4.9.5+git.317.6d82fb3918b-3.35.1 |
samba SUSE:Linux Enterprise High Performance Computing 15-ESPOS | All versions | 4.7.11+git.231.7f324c4d89e-4.40.1 |
samba SUSE:Linux Enterprise High Performance Computing 15-LTSS | All versions | 4.7.11+git.231.7f324c4d89e-4.40.1 |
samba SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 4.9.5+git.317.6d82fb3918b-3.35.1 |
samba SUSE:Linux Enterprise Module for Python 2 15 SP1 | All versions | 4.9.5+git.317.6d82fb3918b-3.35.1 |
samba SUSE:Linux Enterprise Server 15-LTSS | All versions | 4.7.11+git.231.7f324c4d89e-4.40.1 |
samba SUSE:Linux Enterprise Server for SAP Applications 15 | All versions | 4.7.11+git.231.7f324c4d89e-4.40.1 |
samba openSUSE:Leap 15.1 | All versions | 4.9.5+git.317.6d82fb3918b-lp151.2.24.1 |
Products include Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Samba Samba.
How do I fix CVE-2020-10704?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2020-10704 being exploited?
There is no known exploitation of CVE-2020-10704 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2020-10704, CLSA-2025-1764151714, DEBIAN-CVE-2020-10704, ECHO-651d-aa48-5dc7, GHSA-hxwv-6335-26h5, SUSE-SU-2020:1132-1 and 4 more.