Stack-based buffer overflow in zsh - CVE-2018-1071

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU12187

Stack-based buffer overflow in zsh - CVE-2018-1071

Published: April 26, 2018


Vulnerability identifier: #VU12187
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-1071
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The weakness exists in the exec.c:hashcmd() function due to stack-based buffer overflow. A local attacker can trigger memory corruption and cause the service to crash.

Affected software

zsh
Gentoo Linux
Amazon Linux AMI
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power
SUSE Linux Enterprise Debuginfo
SUSE Linux Enterprise Point of Sale
SUSE Linux Enterprise Server
SUSE Linux
Slackware Linux
Opensuse
Fedora
zsh (Alpine package)
zsh
zsh-debuginfo
zsh-debugsource

How to mitigate CVE-2018-1071

Install update from vendor's website.

zsh (Alpine package) - update to 5.2-r2
zsh - update to 4.3.6-67.9.8.1
zsh-debuginfo - update to 4.3.6-67.9.8.1
zsh-debugsource - update to 4.3.6-67.9.8.1
zsh - addressed in versions 5.4.1-3.fc27, 5.5-1.fc28

External References

Related Security Bulletins