Bug 1535667

Summary:	glibc: Information leak via glibc finished thread cache
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aoliva, arjun, ashankar, codonell, dj, fweimer, glibc-bugzilla, law, mfabian, mnewsome, pfrankli, rth, security-response-team, siddhesh, tcallawa
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-02-20 07:45:17 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:	1535668, 1535669, 1546604, 1546605
Bug Blocks:	1535681

Description Pedro Sampaio 2018-01-17 20:56:34 UTC

A flaw was found in glibc. GNU Libc have special caches to keep stacks and heaps of finished threads. This behavior may break ASRL by leaking addresses of ended thread stack or heap.

Comment 5 Huzaifa S. Sidhpurwala 2018-01-30 07:00:42 UTC

Statement:

This flaw can be used to leak addresses of data objects allocated on the stack or the heap. Since ASLR (Address Space Layout Randomization) is a post exploitation mitigation measure, Red Hat Product Security does not consider this as a security flaw, but rather a security hardening.

Comment 6 Doran Moppert 2018-02-19 01:47:49 UTC

Upstream bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=22852

Comment 7 Doran Moppert 2018-02-19 01:48:17 UTC

Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1546605]


Created glibc-arm-linux-gnu tracking bugs for this issue:

Affects: fedora-all [bug 1546604]

Comment 8 Adam Mariš 2018-03-01 11:00:26 UTC

Reference:

http://www.openwall.com/lists/oss-security/2018/02/27/5