Ubuntu update for samba



| Updated: 2025-04-23
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2020-10730
CVE-2020-10745
CVE-2020-10760
CWE-ID CWE-476
CWE-400
CWE-416
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #3 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

samba (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU29483

Risk: Medium

CVSSv4.0: 5.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-10730

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in Samba AD DC LDAP Server with ASQ, VLV and paged_results. A remote authenticated user can pass specially crafted data to the application and perform a denial of service (DoS) attack by triggering a NULL pointer dereference or us-after-free error.

Mitigation

Update the affected package samba to the latest version.

Vulnerable software versions

Ubuntu: 12.04 - 20.04

samba (Ubuntu package): before 2:3.6.25-0ubuntu0.12.04.20

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4409-1


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Resource exhaustion

EUVDB-ID: #VU29484

Risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2020-10745

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources when processing NBT and DNS replies.  A remote attacker can send a name in the reply to a NBT or DNS request and consume excessive CPU resources, resulting in denial of service conditions.

Mitigation

Update the affected package samba to the latest version.

Vulnerable software versions

Ubuntu: 12.04 - 20.04

samba (Ubuntu package): before 2:3.6.25-0ubuntu0.12.04.20

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4409-1


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

3) Use-after-free

EUVDB-ID: #VU29485

Risk: Medium

CVSSv4.0: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:P/U:Green]

CVE-ID: CVE-2020-10760

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error  in Samba AD DC Global Catalog with paged_results and VLV. A remote user can send a specially crafted request to the LDAP server, trigger a use-after-free error and perform a denial of service attack.


Mitigation

Update the affected package samba to the latest version.

Vulnerable software versions

Ubuntu: 12.04 - 20.04

samba (Ubuntu package): before 2:3.6.25-0ubuntu0.12.04.20

CPE2.3 External links

https://ubuntu.com/security/notices/USN-4409-1


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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