Bug 1549841 (CVE-2018-7548)

Summary:	CVE-2018-7548 zsh: null-pointer deref when using ${(PA)...} on an empty array result
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	dmaphy, james.antill, j, kdudka, svashisht
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	zsh 5.5	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:41:51 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1549842, 1549843
Bug Blocks:	1549839

Description Laura Pardo 2018-02-27 21:18:08 UTC

A flaw was found in zsh prior 5.4.2. There is a null-pointer deref when using ${(PA)...} on an empty array result.


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

Comment 1 Laura Pardo 2018-02-27 21:18:50 UTC

Created zsh tracking bugs for this issue:

Affects: fedora-all [bug 1549842]

Comment 3 Kamil Dudka 2018-03-06 14:02:20 UTC

(In reply to Laura Pardo from comment #0)
> A flaw was found in zsh prior 5.4.2

The commit you refer to landed _after_ the 5.4.2 release of zsh and it has not been included in any stable release of zsh yet.