Bug 1478359 (CVE-2017-12424)

Summary:	CVE-2017-12424 shadow-utils: Buffer overflow via newusers tool
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	pkis, pvrabec, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	shadow-utils 4.5	Doc Type:	If docs needed, set a value
Doc Text:	A buffer overflow flaw leading to heap memory corruption was found in the shadow-utils's newusers utility. A local, authenticated attacker could potentially use this flaw to crash the newusers process by supplying crafted data to it.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-09-15 04:49:30 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:	1491933
Bug Blocks:	1478361

Description Adam Mariš 2017-08-04 12:27:05 UTC

In shadow before 4.5, the newusers tool could be made to manipulate
internal data structures in ways unintended by the authors. Malformed
input may lead to crashes (with a buffer overflow or other memory
corruption) or other unspecified behaviors. This crosses a privilege
boundary in, for example, certain web-hosting environments in which a
Control Panel allows an unprivileged user account to create
subaccounts.

Upstream patch:

https://github.com/shadow-maint/shadow/commit/954e3d2e7113e9ac06632aee3c69b8d818cc8952

Comment 3 Dhiru Kholia 2017-09-15 04:46:50 UTC

Created shadow-utils tracking bugs for this issue:

Affects: fedora-all [bug 1491933]