Bug 1300299 (CVE-2015-8776)

Summary:	CVE-2015-8776 glibc: Segmentation fault caused by passing out-of-range data to strftime()
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aavati, arjun.is, ashankar, codonell, fweimer, jakub, jwalter, law, mfabian, mnewsome, nlevinki, pfrankli, rfortier, rhs-bugs, sardella, sgirijan, siddhesh, slawomir, ssaha, vbellur, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	glibc 2.23	Doc Type:	Bug Fix
Doc Text:	It was found that out-of-range time values passed to the strftime() function could result in an out-of-bounds memory access. This could lead to application crash or, potentially, information disclosure.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:47:32 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:	1300300, 1358011, 1374658
Bug Blocks:	1300316, 1386080, 1415638

Description Adam Mariš 2016-01-20 12:42:55 UTC

It was found that out-of-range time values passed to the strftime function may cause it to crash, leading to a denial of service, or potentially disclosure information.

Upstream bug:

https://sourceware.org/bugzilla/show_bug.cgi?id=18985

CVE assignment:

http://seclists.org/oss-sec/2016/q1/153

Comment 1 Adam Mariš 2016-01-20 12:45:19 UTC

Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1300300]

Comment 2 Huzaifa S. Sidhpurwala 2016-01-21 07:52:30 UTC

Upstream commit at:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d36c75fc0d44deec29635dd239b0fbd206ca49b7

Comment 3 Huzaifa S. Sidhpurwala 2016-01-22 06:14:04 UTC

Public reproducer available at:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=blob_plain;f=time/tst-strftime.c;h=af3ff72faf9588126fb269b0e9080357c32b5fcb;hb=d36c75fc0d44deec29635dd239b0fbd206ca49b7

Comment 6 Martin Prpič 2016-07-07 07:56:39 UTC

Mitigation:

Check time values before they are passed to strftime, or call strftime only with struct tm values computed by gmtime or localtime.

Comment 8 errata-xmlrpc 2017-03-21 10:35:11 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0680 https://rhn.redhat.com/errata/RHSA-2017-0680.html

Comment 10 errata-xmlrpc 2017-08-01 18:12:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1916 https://access.redhat.com/errata/RHSA-2017:1916