CVE-2018-20481 Null dereference in n/a

What is CVE-2018-20481?

CVE-2018-20481 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 26 Dec 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

XRef::getEntry in XRef.cc in Poppler 0.72.0 mishandles unallocated XRef entries, which allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted PDF document, when XRefEntry::setFlag in XRef.h is called from Parser::makeStream in Parser.cc.

Weakness: CWE-476

Which versions are affected by CVE-2018-20481?

It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Freedesktop Poppler.

How do I fix CVE-2018-20481?

Upgrade to a fixed version.

Is CVE-2018-20481 being exploited?

There is no known exploitation of CVE-2018-20481 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-20481, GHSA-hw98-2857-jggj, UBUNTU-CVE-2018-20481.