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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | samba | All versions before 4.10.15, All versions before 4.11.8, All versions before 4.12.2 | — |
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 | samba | 2:4.12.3+dfsg-2 | — |
| Debian 13 | samba | 2:4.12.3+dfsg-2 | — |
| Debian 12 | samba | 2:4.12.3+dfsg-2 | — |
| Debian 9 | samba | 2:4.5.16+dfsg-1+deb9u3 | DLA-2463-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | samba | 2:4.11.6+dfsg-0ubuntu1.1 | USN-4341-1 |
| Ubuntu 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.16 | USN-4341-1 |
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.26 | USN-4341-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm6 | USN-4341-2 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | ldb | 2.0.12-3.3.1 | SUSE-SU-2020:1948-1 |
| SLES 15 SP2 | samba | 4.11.11+git.180.2cf3b203f07-4.5.1 | SUSE-SU-2020:1948-1 |
| SLES 15 SP1 | samba | 4.9.5+git.317.6d82fb3918b-3.35.1 | SUSE-SU-2020:1133-1 |
| SLES 15 | samba | 4.7.11+git.231.7f324c4d89e-4.40.1 | SUSE-SU-2020:1132-1 |
| SLES 12 SP5 | ldb | 1.5.8-3.5.1 | SUSE-SU-2020:2673-1 |
| SLES 12 SP5 | samba | 4.10.17+git.203.862547088ca-3.14.1 | SUSE-SU-2020:2673-1 |
| SLES 2 | samba | 4.9.5+git.317.6d82fb3918b-3.35.1 | SUSE-SU-2020:1948-1, SUSE-SU-2020:1133-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 | samba | 4.7.11+git.231.7f324c4d89e-4.40.1 | SUSE-SU-2020:1132-1 |
| SLES for SAP 12 SP5 | ldb | 1.5.8-3.5.1 | SUSE-SU-2020:2673-1 |
| SLES for SAP 12 SP5 | samba | 4.10.17+git.203.862547088ca-3.14.1 | SUSE-SU-2020:2673-1 |
| SLE HPC 15 | samba | 4.7.11+git.231.7f324c4d89e-4.40.1 | SUSE-SU-2020:1132-1 |
| SUSE Enterprise Storage 6 | samba | 4.9.5+git.317.6d82fb3918b-3.35.1 | SUSE-SU-2020:1133-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.14.6+git.182.2205d5224e3-1.1 | openSUSE-SU-2024:11365-1 |
| openSUSE Leap 15.2 | ldb | 2.0.12-lp152.2.3.1 | openSUSE-SU-2020:1313-1, openSUSE-SU-2020:1023-1 |
| openSUSE Leap 15.2 | samba | 4.11.11+git.180.2cf3b203f07-lp152.3.3.1 | openSUSE-SU-2020:1313-1, openSUSE-SU-2020:1023-1 |
| openSUSE Leap 15.1 | samba | 4.9.5+git.317.6d82fb3918b-lp151.2.24.1 | openSUSE-SU-2020:0601-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.12.2-r0 | — |
| Alpine v3.23 | samba | 4.12.2-r0 | — |
| Alpine v3.22 | samba | 4.12.2-r0 | — |
| Alpine v3.21 | samba | 4.12.2-r0 | — |
| Alpine v3.20 | samba | 4.12.2-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.12.2-r0 | — |
| Alpine v3.18 | samba | 4.12.2-r0 | — |
| Alpine v3.17 | samba | 4.12.2-r0 | — |
| Alpine v3.16 | samba | 4.12.2-r0 | — |
| Alpine v3.15 | samba | 4.12.2-r0 | — |
| Alpine v3.14 | samba | 4.12.2-r0 | — |
| Alpine v3.13 | samba | 4.12.2-r0 | — |
| Alpine v3.12 | samba | 4.12.2-r0 | — |
| Alpine v3.11 | samba | 4.11.8-r0 | — |
| Alpine v3.10 | samba | 4.10.15-r0 | — |
Advisories 12
- WID-SEC-2026-3123 Samba: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 31, 2026
- USN-4341-2 samba vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4341-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2463-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:2673-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1132-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11365-1 ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1133-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1023-1 Security update for ldb, samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0601-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1313-1 Security update for ldb, samba SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2020:1948-1 Security update for ldb, samba SUSE / openSUSE Security Updates · May 2, 2025
References
- FEDORA-2020-e244c98af5 vendor-advisory
- FEDORA-2020-9cf0b1c8f1 vendor-advisory
- openSUSE-SU-2020:1023 vendor-advisory
- GLSA-202007-15 vendor-advisory
- openSUSE-SU-2020:1313 vendor-advisory
- [debian-lts-announce] 20201123 [SECURITY] [DLA 2463-1] samba security update mailing-list
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10704
- https://www.samba.org/samba/security/CVE-2020-10704.html