Bug 1377923 – CVE-2016-8688 libarchive: heap based buffer overflow in detect_form (archive_read_support_format_mtree.c)

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Bug 1377923 - (CVE-2016-8688) CVE-2016-8688 libarchive: heap based buffer overflow in detect_form (archive_read_support_format_mtree.c)

Summary:	CVE-2016-8688 libarchive: heap based buffer overflow in detect_form (archive_...

Status:	CLOSED WONTFIX

Aliases:	CVE-2016-8688

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
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Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=low,public=20160915,reported=2...
Keywords:	Security

Duplicates:	1385664 (view as bug list)
Depends On:	1385676 1378669 1385674 1385675
Blocks:	1376684 1385672
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Reported:	2016-09-20 23:30 EDT by Doran Moppert
Modified:	2016-11-08 10:52 EST (History)
CC List:	7 users (show)

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Last Closed:	2016-09-22 23:21:20 EDT
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Description Doran Moppert 2016-09-20 23:30:03 EDT

Bookkeeping errors when extending the read-ahead buffer when trying 
to identify an mtree archive could lead libarchive to significantly
overcalculate the size of the line being read, resulting in heap
out-of-bounds reads or a crash.

Disclosed on oss-security:

http://seclists.org/oss-sec/2016/q3/516

Upstream issue:

https://github.com/libarchive/libarchive/issues/747

Upstream fix:

https://github.com/libarchive/libarchive/commit/eec077f


All the mtree-related crashes in the oss-sec post came from the same 
underlying issue and were resolved in this commit.

Comment 1 Doran Moppert 2016-09-21 23:57:11 EDT

This could conceivably be exploited for controlled read of the heap, but code execution is not possible.

Comment 2 Doran Moppert 2016-09-22 23:17:06 EDT

Created libarchive tracking bugs for this issue:

Affects: fedora-all [bug 1378669]

Comment 3 Doran Moppert 2016-09-22 23:19:30 EDT

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 4 Doran Moppert 2016-10-18 00:31:04 EDT

*** Bug 1385664 has been marked as a duplicate of this bug. ***

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