Multiple vulnerabilities in Samba



Published: 2020-07-02
Risk Medium
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2020-10730
CVE-2020-10745
CVE-2020-10760
CVE-2020-14303
CWE-ID CWE-476
CWE-400
CWE-416
CWE-20
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.
Public exploit code for vulnerability #4 is available.
Vulnerable software
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Samba
Server applications / Directory software, identity management

Vendor Samba

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) NULL pointer dereference

EUVDB-ID: #VU29483

Risk: Medium

CVSSv3.1:

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

Install updates from vendor's website.

Vulnerable software versions

Samba: 4.12.0 - 4.12.3, 4.11.0 - 4.11.10, 4.10.0 - 4.10.16, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16


CPE2.3 External links

http://www.samba.org/samba/security/CVE-2020-10730.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

2) Resource exhaustion

EUVDB-ID: #VU29484

Risk: Medium

CVSSv3.1:

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

Install updates from vendor's website.

Vulnerable software versions

Samba: 4.11.0 - 4.11.10, 4.12.0 - 4.12.3, 4.10.0 - 4.10.16, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16, 4.4.0 - 4.4.16, 4.3.0 - 4.3.13, 4.2.0 - 4.2.14, 4.1.0 - 4.1.23, 4.0.0 - 4.0.26


CPE2.3 External links

http://www.samba.org/samba/security/CVE-2020-10745.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

3) Use-after-free

EUVDB-ID: #VU29485

Risk: Medium

CVSSv3.1:

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

Install updates from vendor's website.

Vulnerable software versions

Samba: 4.12.0 - 4.12.3, 4.11.0 - 4.11.10, 4.10.0 - 4.10.16, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16


CPE2.3 External links

http://www.samba.org/samba/security/CVE-2020-10760.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?

4) Input validation error

EUVDB-ID: #VU29486

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-14303

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 insufficient validation of UDp packets with 0 length data  in Samba. A remote attacker can send a specially crafted UDP packet to port 137/TCP and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Samba: 4.11.0 - 4.11.10, 4.12.0 - 4.12.3, 4.10.0 - 4.10.16, 4.9.0 - 4.9.18, 4.8.0 - 4.8.12, 4.7.0 - 4.7.12, 4.6.0 - 4.6.16, 4.5.0 - 4.5.16, 4.4.0 - 4.4.16, 4.3.0 - 4.3.13, 4.2.0 - 4.2.14, 4.1.0 - 4.1.23, 4.0.0 - 4.0.26


CPE2.3 External links

http://www.samba.org/samba/security/CVE-2020-14303.html

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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