Vulnerability identifier: #VU10869

Vulnerability risk: Low

CVSSv3.1: 3.5 [CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-18205

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
zsh
Client/Desktop applications / Software for system administration

Vendor: SourceForge

Description
The vulnerability allows a local unauthenticated attacker to cause DoS condition on the target system.

The weakness exists due to a NULL pointer dereference when processing a cd command while in sh compatibility mode. A local attacker can cause the service to crash.

Mitigation
Update to version 5.4.1.

Vulnerable software versions

zsh: 5.0.0 - 5.3.1

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External links
http://sourceforge.net/projects/zsh/files/zsh-doc/5.4.1/zsh-5.4.1-doc.tar.gz/download

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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