CVE-2020-14323
published 2020-10-29CVE-2020-14323: A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this…
PriorityP420medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.62%
46.1th percentile
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
Affected
22 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | samba | < samba 2:4.13.2+dfsg-2 (bookworm) | samba 2:4.13.2+dfsg-2 (bookworm) |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| msrc | azl3_samba_4.18.3-1_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| msrc | cbl2_samba_4.12.5-6_on_cbl_mariner_2.0 | — | — |
| opensuse | leap | — | — |
| opensuse | leap | — | — |
| samba | samba | — | — |
| samba | samba | >= 0 < 2:4.13.2+dfsg-2 | 2:4.13.2+dfsg-2 |
| samba | samba | >= 0 < 2:4.13.2+dfsg-2 | 2:4.13.2+dfsg-2 |
| samba | samba | >= 0 < 2:4.13.2+dfsg-2 | 2:4.13.2+dfsg-2 |
| samba | samba | >= 0 < 2:4.13.2+dfsg-2 | 2:4.13.2+dfsg-2 |
| samba | samba | >= 0 < 2:4.3.11+dfsg-0ubuntu0.16.04.32 | 2:4.3.11+dfsg-0ubuntu0.16.04.32 |
| samba | samba | >= 0 < 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 |
| samba | samba | >= 0 < 2:4.11.6+dfsg-0ubuntu1.6 | 2:4.11.6+dfsg-0ubuntu1.6 |
| samba | samba | >= 0 < 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 |
| samba | samba | >= 3.6.0 < 4.11.15 | 4.11.15 |
| samba | samba | >= 4.12.0 < 4.12.9 | 4.12.9 |
| samba | samba | >= 4.13.0 < 4.13.1 | 4.13.1 |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv2.02.1LOWAV:L/AC:L/Au:N/C:N/I:N/A:P
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu4.3MEDIUM
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Ubuntu
Samba vulnerabilities
vendor_ubuntu·2021-05-03·CVSS 4.3
CVE-2020-14318 [MEDIUM] Samba vulnerabilities
Title: Samba vulnerabilities
Summary: Several security issues were fixed in Samba.
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
Peter Eriksson discovered that Samba incorrectly handled certain negative
idmap cache entries. Th
Ubuntu
Samba vulnerabilities
vendor_ubuntu·2020-11-02·CVSS 4.3
CVE-2020-14383 [MEDIUM] Samba vulnerabilities
Title: Samba vulnerabilities
Summary: Several security issues were fixed in Samba.
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
samba: Unprivileged user can crash winbind
vendor_redhat·2020-10-29·CVSS 5.5
CVE-2020-14323 [MEDIUM] CWE-170 samba: Unprivileged user can crash winbind
samba: Unprivileged user can crash winbind
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
A null pointer dereference flaw was found in Samba's winbind service. This flaw allows a local user to crash the winbind service, causing a denial of service. The highest threat from this vulnerability is to system availability.
Package: samba (Red Hat Enterprise Linux 6) - Out of support scope
Microsoft
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15 before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing d
vendor_msrc·2020-10-13·CVSS 5.5
CVE-2020-14323 [MEDIUM] CWE-476 A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15 before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing d
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15 before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, w
Debian
CVE-2020-14323: samba - A null pointer dereference flaw was found in samba's Winbind service in versions...
vendor_debian·2020·CVSS 5.5
CVE-2020-14323 [MEDIUM] CVE-2020-14323: samba - A null pointer dereference flaw was found in samba's Winbind service in versions...
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
Scope: local
bookworm: resolved (fixed in 2:4.13.2+dfsg-2)
bullseye: resolved (fixed in 2:4.13.2+dfsg-2)
forky: resolved (fixed in 2:4.13.2+dfsg-2)
sid: resolved (fixed in 2:4.13.2+dfsg-2)
trixie: resolved (fixed in 2:4.13.2+dfsg-2)
GHSA
GHSA-fhfw-5p8c-4cxr: A null pointer dereference flaw was found in samba's Winbind service in versions before 4
ghsa_unreviewed·2022-05-24
CVE-2020-14323 [MEDIUM] CWE-170 GHSA-fhfw-5p8c-4cxr: A null pointer dereference flaw was found in samba's Winbind service in versions before 4
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
OSV
samba vulnerabilities
osv·2021-05-03·CVSS 4.3
CVE-2020-14318 [MEDIUM] samba vulnerabilities
samba vulnerabilities
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
Peter Eriksson discovered that Samba incorrectly handled certain negative
idmap cache entries. This issue could result in certain users gaining
unauthorized ac
OSV
samba vulnerabilities
osv·2020-11-02·CVSS 4.3
CVE-2020-14318 [MEDIUM] samba vulnerabilities
samba vulnerabilities
Steven French discovered that Samba incorrectly handled ChangeNotify
permissions. A remote attacker could possibly use this issue to obtain file
name information. (CVE-2020-14318)
Bas Alberts discovered that Samba incorrectly handled certain winbind
requests. A remote attacker could possibly use this issue to cause winbind
to crash, resulting in a denial of service. (CVE-2020-14323)
Francis Brosnan Blázquez discovered that Samba incorrectly handled certain
invalid DNS records. A remote attacker could possibly use this issue to
cause the DNS server to crash, resulting in a denial of service.
(CVE-2020-14383)
OSV
CVE-2020-14323: A null pointer dereference flaw was found in samba's Winbind service in versions before 4
osv·2020-10-29·CVSS 5.5
CVE-2020-14323 [MEDIUM] CVE-2020-14323: A null pointer dereference flaw was found in samba's Winbind service in versions before 4
A null pointer dereference flaw was found in samba's Winbind service in versions before 4.11.15, before 4.12.9 and before 4.13.1. A local user could use this flaw to crash the winbind service causing denial of service.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-14323 samba: Unprivileged user can crash winbind [fedora-all]
bugzilla·2020-10-29·CVSS 5.5
CVE-2020-14323 [MEDIUM] CVE-2020-14323 samba: Unprivileged user can crash winbind [fedora-all]
CVE-2020-14323 samba: Unprivileged user can crash winbind [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 multiple supported versions of Fed
Bugzilla
CVE-2020-14323 samba: Unprivileged user can crash winbind
bugzilla·2020-10-27·CVSS 5.5
CVE-2020-14323 [MEDIUM] CVE-2020-14323 samba: Unprivileged user can crash winbind
CVE-2020-14323 samba: Unprivileged user can crash winbind
As per upstream advisory:
winbind in version 3.6 and later implements a request to translate multiple Windows SIDs into names in one request. This was done for performance reasons: The Microsoft RPC call domain controllers offer to do this translation offer this batch operation, so it was an obvious extension to also offer this batch operation on the winbind unix domain stream socket that is available to local processes on the Samba server.
Due to improper input validation a hand-crafted packet can make winbind perform a NULL pointer dereference and thus crash.
Discussion:
Acknowledgments:
Name: the Samba project
Upstream: Bas Alberts (GitHub Security Lab Team)
---
External References:
https://www.samba.org/samba/security/C
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00008.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-11/msg00012.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=1891685https://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlhttps://lists.debian.org/debian-lts-announce/2024/04/msg00015.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JE2M4FE3N3EDXVG4UKSVFPL7SQUGFFDP/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W6HM73N4NEGFW5GIJJGGP6ZZBS6GTXPB/https://security.gentoo.org/glsa/202012-24https://security.netapp.com/advisory/ntap-20201103-0001/https://www.samba.org/samba/security/CVE-2020-14323.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-11/msg00008.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-11/msg00012.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=1891685https://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlhttps://lists.debian.org/debian-lts-announce/2024/04/msg00015.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JE2M4FE3N3EDXVG4UKSVFPL7SQUGFFDP/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W6HM73N4NEGFW5GIJJGGP6ZZBS6GTXPB/https://security.gentoo.org/glsa/202012-24https://security.netapp.com/advisory/ntap-20201103-0001/https://www.samba.org/samba/security/CVE-2020-14323.html
2020-10-29
Published