Bug 1557382 (CVE-2018-1083)

Summary:	CVE-2018-1083 zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dmaphy, james.antill, j, kdudka, rcosta, security-response-team, 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:	A buffer overflow flaw was found in the zsh shell auto-complete functionality. A local, unprivileged user can create a specially crafted directory path which leads to code execution in the context of the user who tries to use auto-complete to traverse the before mentioned path. If the user affected is privileged, this leads to privilege escalation.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:17:57 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:	1560696, 1560697, 1560700, 1560701, 1560702
Bug Blocks:	1557385

Description Pedro Sampaio 2018-03-16 14:01:25 UTC

zsh is vulnerable to a stack-based buffer overflow in the gen_matches_files() function. A local attacker could exploit this through tab completion of directories with long names leading to arbitrary code execution.

Comment 8 Sam Fowler 2018-03-26 02:53:27 UTC

Upstream Patch:

https://sourceforge.net/p/zsh/code/ci/259ac472eac291c8c103c7a0d8a4eaf3c2942ed7

Comment 9 Richard Maciel Costa 2018-03-26 19:10:55 UTC

Created zsh tracking bugs for this issue:

Affects: fedora-all [bug 1560696]

Comment 12 Richard Maciel Costa 2018-05-25 13:13:45 UTC

Acknowledgments:

Name: Richard Maciel Costa (Red Hat)

Comment 13 errata-xmlrpc 2018-06-19 04:56:26 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:1932 https://access.redhat.com/errata/RHSA-2018:1932

Comment 14 errata-xmlrpc 2018-10-30 07:30:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3073 https://access.redhat.com/errata/RHSA-2018:3073