Vulnerability identifier: #VU10856

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-2018-7549

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

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

Vendor: SourceForge

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

The weakness exists in the params.c source code file due to improper handling of hash tables. A local attacker can copy an empty hash table with the typeset -p command and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

zsh: 5.0.0 - 5.4.2

---

External links
http://sourceforge.net/p/zsh/code/ci/c2cc8b0fbefc9868fa83537f5b6d90fc1ec438dd/

---

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.