Vulnerability identifier: #VU60186

Vulnerability risk: High

CVSSv3.1:

CVE-ID: CVE-2021-44142

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Samba
Server applications / Directory software, identity management

Vendor: Samba

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing EA metadata while opening files in smbd within the VFS Samba module (vfs_fruit). A remote attacker with ability to write to file's extended attributes can trigger an out-of-bounds write and execute arbitrary code with root privileges.

Note, the vulnerability in vfs_fruit exists in the default configuration of the fruit VFS module using fruit:metadata=netatalk or fruit:resource=file.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Samba: 4.15.0 - 4.15.4, 4.14.0 - 4.14.11, 4.13.0 - 4.13.16, 4.12.0 - 4.12.15, 4.11.0 - 4.11.17, 4.10.0 - 4.10.18, 4.9.0 - 4.9.18, 1.9.16 - 1.9.18, 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, 3.6.0 - 3.6.25, 3.5 - 3.5.22, 3.1 - 3.1.0, 3.4 - 3.4.17, 2.2 - 2.2a, 3.3 - 3.3.16, 3.0 - 3.0.37, 3.2 - 3.2.15, 2.18.3, 2.0 - 2.0.10

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CPE

• cpe:2.3:a:samba:samba:4.15.4:*:*:*:*:*:*:*

External links
http://www.samba.org/samba/security/CVE-2021-44142.html

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?