Bug 1602838 – CVE-2018-13988 poppler: out of bounds read in pdfunite

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Bug 1602838 - (CVE-2018-13988) CVE-2018-13988 poppler: out of bounds read in pdfunite

Summary:	CVE-2018-13988 poppler: out of bounds read in pdfunite

Status:	NEW

Aliases:	CVE-2018-13988

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

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20180723,reported=2...
Keywords:	Security

Depends On:	1607462 1607461 1607463 1609036
Blocks:	1602839
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Reported:	2018-07-18 11:27 EDT by Laura Pardo
Modified:	2018-10-30 03:42 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	poppler 0.67.0
Doc Type:	If docs needed, set a value
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Last Closed:
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:3140	None	None	None	2018-10-30 03:42 EDT

Groups: None (edit)

Description Laura Pardo 2018-07-18 11:27:08 EDT

An out-of-bounds read flaw was found in the Poppler library as demonstrated by pdfunite. This may result in a denial of service or other undefined behavior. This flaw may be exploitable when a victim opens a specially crafted PDF file.

Upstream Patch: https://cgit.freedesktop.org/poppler/poppler/commit/?id=004e3c10df0abda214f0c293f9e269fdd979c5ee

Comment 1 Laura Pardo 2018-07-23 11:12:49 EDT

Acknowledgments:

Name: Hosein Askari

Comment 2 Laura Pardo 2018-07-23 11:14:14 EDT

Created mingw-poppler tracking bugs for this issue:

Affects: fedora-all [bug 1607462]


Created poppler tracking bugs for this issue:

Affects: fedora-all [bug 1607461]

Comment 4 Scott Gayou 2018-07-26 13:59:57 EDT

Downgrading this to low. No obvious, quickly discovered evidence that this leads to a buffer overflow. Looks like an out of bounds read triggering a segfault. 

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7abc1c1 in XRef::getEntry (this=this@entry=0x6372c0, i=-45027, complainIfMissing=complainIfMissing@entry=true)
    at XRef.cc:1609
1609	  if (i >= size || entries[i].type == xrefEntryNone) {

Offsets negatively into entries and triggers the segfault.

Comment 5 Scott Gayou 2018-07-26 14:16:30 EDT

This was de-embargoed after the reporter reported this upstream, agreed on a release, and the patch came out.

Comment 7 Scott Gayou 2018-07-26 14:23:03 EDT

Statement:

Red Hat Product Security has rated this issue as having a security impact of Low, and a future update may address this flaw.

Comment 9 Scott Gayou 2018-07-26 15:09:20 EDT

RHEL 5 and 6 have similar code and look vulnerable due to the missing check. Untested as pdfunite was not shipped with those versions of poppler and due to low severity. Assumption is affected.

Comment 11 errata-xmlrpc 2018-10-30 03:42:51 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:3140 https://access.redhat.com/errata/RHSA-2018:3140

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