Bug 1332912

Summary:	glibc: nss_hesiod: Heap overflow in get_txt_records
Product:	[Fedora] Fedora	Reporter:	Florian Weimer <fweimer>
Component:	glibc	Assignee:	Florian Weimer <fweimer>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	arjun.is, codonell, dj, fweimer, jakub, law, mfabian, pfrankli, siddhesh
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glibc-2.22-15.fc23, glibc-2.23.1-7.fc24	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-05-15 04:52:59 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Florian Weimer 2016-05-04 10:58:40 UTC

When a completely empty TXT record is received (which is not a valid DNS resource record, nss_hesiod allocates a zero-sized object, and then writes a NUL terminator to it.

No trust boundary is cross, so this is not a security issue, just a regular bug.

Comment 1 Fedora Update System 2016-05-07 17:19:21 UTC

glibc-2.22-15.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 2 Fedora Update System 2016-05-08 16:25:21 UTC

glibc-2.22-15.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 3 Florian Weimer 2016-05-09 09:19:49 UTC

Fixed with this new 2.23 backport:

commit 4c4b3cbb4638ec19de19c167d498e30fd67501ab
Author: Florian Weimer <fweimer>
Date:   Mon May 2 16:04:32 2016 +0200

    hesiod: Avoid heap overflow in get_txt_records [BZ #20031]
    
    (cherry picked from commit 8a03ccbb77f52ec4b55062eeedddb8daec1a33e4)

Comment 4 Fedora Update System 2016-05-09 14:56:59 UTC

glibc-2.23.1-6.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 5 Fedora Update System 2016-05-10 17:57:27 UTC

glibc-2.22-15.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2016-05-10 20:30:15 UTC

glibc-2.23.1-6.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 7 Fedora Update System 2016-05-11 13:55:25 UTC

glibc-2.23.1-7.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 8 Fedora Update System 2016-05-12 09:44:10 UTC

glibc-2.23.1-7.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 9 Fedora Update System 2016-05-14 23:30:06 UTC

glibc-2.23.1-7.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.