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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - Samba 4.9.x before 4.9.9 and 4.10.x before 4.10.5 has a NULL pointer dereference, leading to Denial of
    Service. This is related to the AD DC DNS management server (dnsserver) RPC server process.
    (CVE-2019-12435)

  - 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. (CVE-2019-12436)

Fix vfs_fruit, vfs_glusterfs and smbspool

----

Update to Samba 4.10.5 Security fixes for CVE-2019-12435 and CVE-2019-12436

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Samba running on the remote host is 4.10.0 prior to 4.10.5. It is, therefore, potentially affected by a denial of service vulnerability in the AD DC LDAP server process. 

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It was discovered that Samba incorrectly handled certain RPC messages.
A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2019-12435)

It was discovered that Samba incorrectly handled LDAP pages searches.
A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2019-12436).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
424485	Alpine: multiple ldb packages, multiple samba packages, pam-winbind: security update to 4.10.5-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
424485	Alpine: multiple ldb packages, multiple samba packages, pam-winbind: security update to 4.10.5-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
400489	Alpine: libsmbclient, pam-winbind, multiple samba packages: security update to 4.10.4-r1 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	medium
400489	Alpine: libsmbclient, pam-winbind, multiple samba packages: security update to 4.10.4-r1 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	medium
126518	Fedora 30 : 2:samba (2019-8015e5dc40)	Nessus	Fedora Local Security Checks	medium
126308	4.10.0 < 4.10.5 AC DC LDAP Server Denial of Service Vulnerability (CVE-2019-12436)	Nessus	Misc.	medium
126064	Ubuntu 19.04 : samba vulnerabilities (USN-4018-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2019-12436

medium

Tenable Plugins

medium

medium

medium

medium

medium

medium

medium