Ubuntu update for Samba



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2019-19344
CVE-2019-14907
CVE-2019-14902
CWE-ID CWE-416
CWE-20
CWE-399
Exploitation vector Network
Public exploit N/A
Vulnerable software
 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) Use-after-free

EUVDB-ID: #VU24467

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-19344

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a use-after-free error during DNS zone scavenging. A remote attacker can under rare conditions to query DNS and obtain parts of memory that was written into database during zone scavenging process.

Mitigation

Update the affected packages.

Ubuntu 19.10
samba - 2:4.10.7+dfsg-0ubuntu2.4
Ubuntu 19.04
samba - 2:4.10.0+dfsg-0ubuntu2.8
Ubuntu 18.04 LTS
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.15
Ubuntu 16.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.25

Vulnerable software versions

samba (Ubuntu package): 2:4.3.11+dfsg-0ubuntu0.16.04.1 - 2:4.10.7+dfsg-0ubuntu2.3

CPE2.3 External links

https://usn.ubuntu.com/4244-1/


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.

2) Improper input validation

EUVDB-ID: #VU24466

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-14907

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to incorrect processing of certain user-controlled string, if logging is enabled at level 3 or above. A remote attacker can send specially crafted data to the Samba DC and terminate Samba RPC server.

Mitigation

Update the affected packages.

Ubuntu 19.10
samba - 2:4.10.7+dfsg-0ubuntu2.4
Ubuntu 19.04
samba - 2:4.10.0+dfsg-0ubuntu2.8
Ubuntu 18.04 LTS
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.15
Ubuntu 16.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.25

Vulnerable software versions

samba (Ubuntu package): 2:4.3.11+dfsg-0ubuntu0.16.04.1 - 2:4.10.7+dfsg-0ubuntu2.3

CPE2.3 External links

https://usn.ubuntu.com/4244-1/


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.

3) Resource management error

EUVDB-ID: #VU24465

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-14902

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security checks.

The vulnerability exists due to absent full-sync replication that did not allow ACL changes to be replicated to all domain controllers. A remote attacker can gain access to sensitive resources.

Mitigation

Update the affected packages.

Ubuntu 19.10
samba - 2:4.10.7+dfsg-0ubuntu2.4
Ubuntu 19.04
samba - 2:4.10.0+dfsg-0ubuntu2.8
Ubuntu 18.04 LTS
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.15
Ubuntu 16.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.25

Vulnerable software versions

samba (Ubuntu package): 2:4.3.11+dfsg-0ubuntu0.16.04.1 - 2:4.10.7+dfsg-0ubuntu2.3

CPE2.3 External links

https://usn.ubuntu.com/4244-1/


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.



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