Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Samba | Samba | 4.10.0 (including) | 4.10.5 (excluding) |
| Samba | Ubuntu | devel | * |
| Samba | Ubuntu | disco | * |
| Samba | Ubuntu | trusty | * |
| Samba | Ubuntu | upstream | * |
Potential Mitigations
References
- http://www.securityfocus.com/bid/108823
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/
- https://usn.ubuntu.com/4018-1/
- https://www.samba.org/samba/security/CVE-2019-12436.html
- https://www.synology.com/security/advisory/Synology_SA_19_27
- http://www.securityfocus.com/bid/108823
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/
- https://usn.ubuntu.com/4018-1/
- https://www.samba.org/samba/security/CVE-2019-12436.html
- https://www.synology.com/security/advisory/Synology_SA_19_27