Bug 1081307 (CVE-2018-7174) - VUL-1: CVE-2018-7174: xpdf: An infinite loop in XRef::Xref allows an attacker to cause denial of service because loop detection exists only for tables, not streams.
Summary: VUL-1: CVE-2018-7174: xpdf: An infinite loop in XRef::Xref allows an attacker...
Status: RESOLVED INVALID
Alias: CVE-2018-7174
Product: SUSE Security Incidents
Classification: Novell Products
Component: Incidents (show other bugs)
Version: unspecified
Hardware: Other Other
: P3 - Medium : Normal
Target Milestone: ---
Assignee: Peter Simons
QA Contact: Security Team bot
URL: https://smash.suse.de/issue/200310/
Whiteboard: CVSSv3:SUSE:CVE-2018-7174:5.5:(AV:L/A...
Keywords:
Depends on:
Blocks: 1133493
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Reported: 2018-02-16 09:01 UTC by Karol Babioch
Modified: 2023-06-14 14:47 UTC (History)
3 users (show)

See Also:
Found By: Security Response Team
Services Priority:
Business Priority:
Blocker: ---
Marketing QA Status: ---
IT Deployment: ---

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Description Karol Babioch 2018-02-16 09:01:09 UTC 
CVE-2018-7174

An issue was discovered in xpdf 4.00. An infinite loop in XRef::Xref allows an
attacker to cause denial of service because loop detection exists only for
tables, not streams.

References:
https://bugzilla.redhat.com/show_bug.cgi?id=1546052
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-7174
http://www.cvedetails.com/cve/CVE-2018-7174/
https://forum.xpdfreader.com/viewtopic.php?f=3&t=605
https://forum.xpdfreader.com/viewtopic.php?f=3&t=605
Comment 1 Peter Simons 2018-06-21 09:20:04 UTC 
No fix was published for this issue. Upstream says they fixed it in their own source code but they did not share the actual diff. There is a vague description saying

> The XRef class has loop detection code, but it was only 
> checking xref tables, and not xref streams. The fix was
> simple: just move the detection code from XRef::readXRefTable()
> to XRef::readXRef().

but I am not sure how to translate that into an actually applicable patch. Red Hat doesn't have a fix either yet; both of their tracker bugs remain open.
Comment 2 Petr Gajdos 2023-06-12 09:53:40 UTC 
Testcase:

https://github.com/skysider/FuzzVuln/blob/master/xpdf_pdftohtml_infinite_loop_XRef_XRef.pdf

I can reproduce the infinite loop in 11sp1/poppler only.
Comment 3 Petr Gajdos 2023-06-13 06:48:21 UTC 
(In reply to Petr Gajdos from comment #2)
> Testcase:
> 
> https://github.com/skysider/FuzzVuln/blob/master/
> xpdf_pdftohtml_infinite_loop_XRef_XRef.pdf
> 
> I can reproduce the infinite loop in 11sp1/poppler only.

However, 11sp1/poppler is not maintained anymore. Suggest to close this.