CVE-2018-7548 : In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using

In subst.c in zsh through 5.4.2, there is a NULL pointer dereference when using ${(PA)...} on an empty array result.

Published 2018-02-27 22:29:01

Updated 2019-03-05 18:30:06

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2018-7548

Canonical » Ubuntu Linux » Version: 17.10
cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
Matching versions
ZSH » ZSH
Versions up to, including, (<=) 5.4.2
cpe:2.3:a:zsh:zsh:*:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.32%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 66 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

Assigned by: nvd@nist.gov (Primary)

https://sourceforge.net/p/zsh/code/ci/110b13e1090bc31ac1352b28adc2d02b6d25a102

zsh / Code / Commit [110b13]
Patch;Third Party Advisory
https://usn.ubuntu.com/3593-1/

USN-3593-1: Zsh vulnerabilities | Ubuntu security notices
Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/201805-10

Zsh: Multiple vulnerabilities (GLSA 201805-10) — Gentoo security
Third Party Advisory

CVEs referencing this url

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