Ubuntu update for Samba

Published: 2020-04-28

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-10700 CVE-2020-10704
CWE-ID	CWE-416 CWE-121
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	samba (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU27376

Risk: Medium

CVSSv3.1: 4.2 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10700

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a use-after-free error when Paged results control is combined with ASQ control while performing search operations. A remote authenticated user can send a specially crafted LDAP search query, trigger a use-after-free error and perform a denial of service attack.

Mitigation

Update the affected packages.

Ubuntu 20.04 LTS: samba - 2:4.11.6+dfsg-0ubuntu1.1
Ubuntu 19.10: samba - 2:4.10.7+dfsg-0ubuntu2.5
Ubuntu 18.04 LTS: samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.16
Ubuntu 16.04 LTS: samba - 2:4.3.11+dfsg-0ubuntu0.16.04.26

Vulnerable software versions

samba (Ubuntu package): 2:4.3.11+dfsg-0ubuntu0.16.04.1 - 2:4.10.7+dfsg-0ubuntu2.4

External links

http://usn.ubuntu.com/4341-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Stack-based buffer overflow

EUVDB-ID: #VU27377

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-10704

CWE-ID: CWE-121 - Stack-based buffer overflow