Bug 1626187 – CVE-2018-0502 zsh: Improper parsing of the shebang line with special chars

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Bug 1626187 - (CVE-2018-0502) CVE-2018-0502 zsh: Improper parsing of the shebang line with special chars

Summary:	CVE-2018-0502 zsh: Improper parsing of the shebang line with special chars

Status:	CLOSED NOTABUG

Aliases:	CVE-2018-0502

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20180904,repor...
Keywords:	Security

Depends On:	1626191 1626190
Blocks:	1626189
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Reported:	2018-09-06 13:28 EDT by Pedro Sampaio
Modified:	2018-10-05 05:46 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	zsh 5.6
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-10-05 05:46:37 EDT
Type:	---
Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Pedro Sampaio 2018-09-06 13:28:17 EDT

An issue was discovered in zsh before 5.6. The beginning of a #! script file was mishandled, potentially leading to an execve call to a program named on the second line.

Upstream patch:

https://sourceforge.net/p/zsh/code/ci/1c4c7b6a4d17294df028322b70c53803a402233d

References:

https://www.zsh.org/mla/zsh-announce/136

Comment 1 Pedro Sampaio 2018-09-06 13:29:52 EDT

Created zsh tracking bugs for this issue:

Affects: fedora-all [bug 1626190]

Comment 3 Riccardo Schirone 2018-10-05 05:46:37 EDT

Closing this as NOTABUG and asked to MITRE to reject the CVE. Executing the second line of a script is not a security issue, since in the moment you execute a script you already expect all commands inside it to be executed.

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