PT-2017-4092 · Gnu+3 · Zsh+3

Anthony Sottile + 1 · Published 2017-11-27 · Updated 2025-08-23 · CVE-2018-0502

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions zsh versions prior to 5.6

Description The issue is related to the incorrect handling of a script containing #!. This could potentially allow a remote attacker to access confidential data, compromise its integrity, and cause a denial of service. The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line.

Recommendations For versions prior to 5.6, update to version 5.6 or later to resolve the issue. As a temporary workaround, consider restricting the execution of scripts containing #! to minimize the risk of exploitation.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

ALT-PU-2018-2654

BDU:2021-01451

CVE-2018-0502

DLA-2470-1

OPENSUSE-SU-2018_2741-1

OPENSUSE-SU-2018_2966-1

OPENSUSE-SU-2024:11543-1

SUSE-SU-2018:2686-1

SUSE-SU-2018_2686-1

SUSE-SU-2022:0161-1

SUSE-SU-2022:14910-1

SUSE-SU-2022_0161-1

SUSE-SU-2022_14910-1

USN-3764-1

Affected Products

Alt Linux

Suse

Ubuntu

Zsh

References · 97

• https://bdu.fstec.ru/vul/2021-01451 · Security Note
• https://osv.dev/vulnerability/DLA-2470-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-01452 · Security Note
• https://sourceforge.net/p/zsh/code/ci/1c4c7b6a4d17294df028322b70c53803a402233d · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2018-0502 · Security Note
• https://ubuntu.com/security/CVE-2018-13259 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-0502 · Security Note
• https://ubuntu.com/security/CVE-2018-0502 · Vendor Advisory
• https://zsh.org/mla/zsh-announce/136 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-0502 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2022:0161-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-0502 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18206 · Security Note
• https://bdu.fstec.ru/vul/2021-01390 · Security Note
• https://security-tracker.debian.org/tracker/DLA-2470-1 · Vendor Advisory