CVE-2018-20481: Null Pointer Dereference
First published: Wed Dec 26 2018(Updated: )
A flaw was found in Poppler 0.72.0. A NULL pointer dereference in the XRef::getEntry class in XRef.cc file due to the mishandle of unallocated XRef entries. This allows remote attackers to cause a denial of service via a crafted PDF document, when XRefEntry::setFlag in XRef.h is called from Parser::makeStream in Parser.cc. References: <a href="https://gitlab.freedesktop.org/poppler/poppler/issues/692">https://gitlab.freedesktop.org/poppler/poppler/issues/692</a> Upstream Patch: <a href="https://gitlab.freedesktop.org/poppler/poppler/merge_requests/143">https://gitlab.freedesktop.org/poppler/poppler/merge_requests/143</a>
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| freedesktop poppler | =0.72.0 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =18.10 | |
| Debian Debian Linux | =8.0 | |
| debian/poppler | 20.09.0-3.1+deb11u1 22.12.0-2 24.08.0-2 |
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Reference Links
- http://www.securityfocus.com/bid/106321
- https://access.redhat.com/errata/RHSA-2019:2022
- https://access.redhat.com/errata/RHSA-2019:2713
- https://gitlab.freedesktop.org/poppler/poppler/issues/692
- https://gitlab.freedesktop.org/poppler/poppler/merge_requests/143
- https://lists.debian.org/debian-lts-announce/2019/03/msg00008.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00018.html
- https://usn.ubuntu.com/3865-1/
- https://launchpad.net/bugs/cve/CVE-2018-20481
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1665269
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1665268
- https://access.redhat.com/security/cve/cve-2018-20481
- https://bugzilla.redhat.com/show_bug.cgi?id=1665266
- https://gitlab.freedesktop.org/poppler/poppler/commit/39a251b1b3a3343400a08e2f03c5518a26624626
- https://security-tracker.debian.org/tracker/CVE-2018-20481
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20481
- https://nvd.nist.gov/vuln/detail/CVE-2018-20481
- https://ubuntu.com/security/CVE-2018-20481
Frequently Asked Questions
What is CVE-2018-20481?
CVE-2018-20481 is a vulnerability in the Poppler PDF library that allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted PDF document.
How does CVE-2018-20481 affect the affected software?
CVE-2018-20481 affects the Poppler package version 0.72.0 and prior on Debian and Ubuntu Linux distributions.
What is the severity of CVE-2018-20481?
CVE-2018-20481 has a severity rating of 6.5 (medium).
How can I fix the CVE-2018-20481 vulnerability?
To fix the CVE-2018-20481 vulnerability, you should update the Poppler package to version 0.71.0-5 or later on Debian, or version 0.41.0-0ubuntu1.11 or later on Ubuntu.
Where can I find more information about CVE-2018-20481?
More information about CVE-2018-20481 can be found at the following references: [http://www.securityfocus.com/bid/106321](http://www.securityfocus.com/bid/106321) and [https://access.redhat.com/errata/RHSA-2019:2022](https://access.redhat.com/errata/RHSA-2019:2022)
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