CVE-2019-12436
published 2019-06-19CVE-2019-12436: 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…
PriorityP432medium6.5CVSS 3.0
AVNACLPRLUINSUCNINAH
EPSS
2.84%
85.3th percentile
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.
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| debian | samba | — | — |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 0 < 4.10.5-r0 | 4.10.5-r0 |
| samba | samba | >= 4.10.0 < 4.10.5 | 4.10.5 |
CVSS provenance
nvdv3.06.5MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv2.04.0MEDIUMAV:N/AC:L/Au:S/C:N/I:N/A:P
osv6.5MEDIUM
vendor_debian6.5LOW
vendor_redhat6.5MEDIUM
vendor_ubuntu6.5MEDIUM
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GHSA
GHSA-8c68-g8rx-85g8: Samba 4
ghsa_unreviewed·2022-05-24
CVE-2019-12436 [MEDIUM] GHSA-8c68-g8rx-85g8: Samba 4
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.
OSV
CVE-2019-12436: Samba 4
osv·2019-06-19·CVSS 6.5
CVE-2019-12436 [MEDIUM] CVE-2019-12436: Samba 4
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.
Ubuntu
Samba vulnerabilities
vendor_ubuntu·2019-06-19·CVSS 6.5
CVE-2019-12435 [MEDIUM] Samba vulnerabilities
Title: Samba vulnerabilities
Summary: Samba could be made to crash if it received specially crafted network
traffic.
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)
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
vendor_redhat·2019-06-19·CVSS 6.5
CVE-2019-12436 [MEDIUM] CWE-476 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
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.
Statement: This issue did not affect the version of samba as shipped with 'Red Hat Gluster Storage 3' as they did not include support for Active Directory Domain Controller.
Mitigation: Return to the default configuration by running 'samba' with -M standard, however this may consume more memory.
Package: samba (Red Hat Enterprise Linux 5) - Not affected
Package: samba (Red Hat Enterprise Linux 6) - Not affected
Package: samba4 (Red Hat Enterprise Linux 6) - Not
Debian
CVE-2019-12436: samba - Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC L...
vendor_debian·2019·CVSS 6.5
CVE-2019-12436 [MEDIUM] CVE-2019-12436: samba - Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC L...
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.
Scope: local
bookworm: resolved
bullseye: resolved
forky: resolved
sid: resolved
trixie: resolved
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos [fedora-all]
bugzilla·2019-06-19·CVSS 6.5
CVE-2019-12436 [MEDIUM] CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos [fedora-all]
CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects
Bugzilla
CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
bugzilla·2019-05-20·CVSS 6.5
CVE-2019-12436 [MEDIUM] CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
CVE-2019-12436 samba: NULL pointer dereference in Samba LDAP server leading to crash and Dos
As per upstream advisory:
A user with read access to the LDAP server can crash the LDAP server process. Depending on the Samba version and the choice of process model, this may crash only the user's own connection.
Specifically, while in Samba 4.10 the default is for one process per connected client, site-specific configuration trigger can change this.
Samba 4.10 also supports the 'prefork' process model and by using the -M option to 'samba' and a 'single' process model. Both of these share on process between multiple clients.
Discussion:
Mitigation:
Return to the default configuration by running 'samba' with -M standard, however this may consume more memory.
---
Acknowledgments:
Name: Th
http://www.securityfocus.com/bid/108823https://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.htmlhttps://www.synology.com/security/advisory/Synology_SA_19_27http://www.securityfocus.com/bid/108823https://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.htmlhttps://www.synology.com/security/advisory/Synology_SA_19_27
2019-06-19
Published