CVE-2020-14303
published 2020-07-06CVE-2020-14303: A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to…
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
3.54%
88.0th percentile
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | debian_linux | — | — |
| debian | samba | < samba 2:4.12.5+dfsg-1 (bookworm) | samba 2:4.12.5+dfsg-1 (bookworm) |
| fedoraproject | fedora | — | — |
| opensuse | leap | — | — |
| opensuse | leap | — | — |
| samba | samba | — | — |
| samba | samba | >= 0 < 2:4.12.5+dfsg-1 | 2:4.12.5+dfsg-1 |
| samba | samba | >= 0 < 2:4.12.5+dfsg-1 | 2:4.12.5+dfsg-1 |
| samba | samba | >= 0 < 2:4.12.5+dfsg-1 | 2:4.12.5+dfsg-1 |
| samba | samba | >= 0 < 2:4.12.5+dfsg-1 | 2:4.12.5+dfsg-1 |
| samba | samba | >= 4.10.0 < 4.10.17 | 4.10.17 |
| samba | samba | >= 4.11.0 < 4.11.11 | 4.11.11 |
| samba | samba | >= 4.12.0 < 4.12.4 | 4.12.4 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
osv7.5HIGH
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
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GHSA
GHSA-gm89-9qf3-7p24: A flaw was found in the AD DC NBT server in all Samba versions before 4
ghsa_unreviewed·2022-05-24
CVE-2020-14303 [MEDIUM] CWE-20 GHSA-gm89-9qf3-7p24: A flaw was found in the AD DC NBT server in all Samba versions before 4
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
OSV
CVE-2020-14303: A flaw was found in the AD DC NBT server in all Samba versions before 4
osv·2020-07-06·CVSS 7.5
CVE-2020-14303 [HIGH] CVE-2020-14303: A flaw was found in the AD DC NBT server in all Samba versions before 4
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
Ubuntu
Samba vulnerability
vendor_ubuntu·2020-08-10
CVE-2020-14303 Samba vulnerability
Title: Samba vulnerability
Summary: Samba could be made to crash if it received specially crafted network
traffic.
Martin von Wittich and Wilko Meyer discovered that Samba incorrectly
handled certain empty UDP packets when being used as a AD DC NBT server. A
remote attacker could possibly use this issue to cause Samba to crash,
resulting in a denial of service.
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
Samba vulnerability
vendor_ubuntu·2020-08-10
CVE-2020-14303 Samba vulnerability
Title: Samba vulnerability
Summary: Samba could be made to crash if it received specially crafted network
traffic.
USN-4454-1 fixed a vulnerability in Samba. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
Martin von Wittich and Wilko Meyer discovered that Samba incorrectly
handled certain empty UDP packets when being used as a AD DC NBT server. A
remote attacker could possibly use this issue to cause Samba to crash,
resulting in a denial of service.
Instructions: In general, a standard system update will make all the necessary changes.
Red Hat
samba: Empty UDP packet DoS in Samba AD DC nbtd
vendor_redhat·2020-07-02·CVSS 7.5
CVE-2020-14303 [HIGH] CWE-400 samba: Empty UDP packet DoS in Samba AD DC nbtd
samba: Empty UDP packet DoS in Samba AD DC nbtd
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
A flaw was found in the AD DC NBT server in Samba. A samba user could send empty UDP packet to cause the samba server to crash.
Statement: This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux and Red Hat Gluster Storage 3 because there is no support for samba as Active Directory Domain Controller.
Mitigation: The NetBIOS over TCP/IP name resolution protocol is implemented as a UDP datagram on port 137.
The AD DC client and server-side processing code for NBT name resolution will enter a tight loop if a UDP packet with
Debian
CVE-2020-14303: samba - A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, b...
vendor_debian·2020·CVSS 7.5
CVE-2020-14303 [HIGH] CVE-2020-14303: samba - A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, b...
A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.
Scope: local
bookworm: resolved (fixed in 2:4.12.5+dfsg-1)
bullseye: resolved (fixed in 2:4.12.5+dfsg-1)
forky: resolved (fixed in 2:4.12.5+dfsg-1)
sid: resolved (fixed in 2:4.12.5+dfsg-1)
trixie: resolved (fixed in 2:4.12.5+dfsg-1)
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd [fedora-all]
bugzilla·2020-07-02·CVSS 7.5
CVE-2020-14303 [HIGH] CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd [fedora-all]
CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd [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 o
Bugzilla
CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd
bugzilla·2020-06-26·CVSS 7.5
CVE-2020-14303 [HIGH] CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd
CVE-2020-14303 samba: Empty UDP packet DoS in Samba AD DC nbtd
As per upstream advisory:
The NetBIOS over TCP/IP name resolution protocol is implemented as a UDP datagram on port 137.
The AD DC client and server-side processing code for NBT name resolution will enter a tight loop if a UDP packet with 0 data length is received. The client for this case is only found in the AD DC side of the codebase, not that used by the the member server or file server.
Discussion:
Acknowledgments:
Name: the Samba project
Upstream: Martin von Wittich (IServ GmbH), Wilko Meyer (IServ GmbH)
---
Mitigation:
The NetBIOS over TCP/IP name resolution protocol is implemented as a UDP datagram on port 137.
The AD DC client and server-side processing code for NBT name resolution will enter a tight loop if
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=1851298%3Bhttps://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YLNQ5GRXUKYRUAOFZ4DUBVN4SMTL6Q2/https://security.gentoo.org/glsa/202007-15https://security.netapp.com/advisory/ntap-20200709-0003/https://usn.ubuntu.com/4454-1/https://usn.ubuntu.com/4454-2/https://www.samba.org/samba/security/CVE-2020-14303.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.htmlhttps://bugzilla.redhat.com/show_bug.cgi?id=1851298%3Bhttps://lists.debian.org/debian-lts-announce/2020/11/msg00041.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6YLNQ5GRXUKYRUAOFZ4DUBVN4SMTL6Q2/https://security.gentoo.org/glsa/202007-15https://security.netapp.com/advisory/ntap-20200709-0003/https://usn.ubuntu.com/4454-1/https://usn.ubuntu.com/4454-2/https://www.samba.org/samba/security/CVE-2020-14303.html
2020-07-06
Published