CVE-2018-9918 Denial of service in n/a

What is CVE-2018-9918?

CVE-2018-9918 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 10 Apr 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

libqpdf.a in QPDF through 8.0.2 mishandles certain "expected dictionary key but found non-name object" cases, allowing remote attackers to cause a denial of service (stack exhaustion), related to the QPDFObjectHandle and QPDF_Dictionary classes, because nesting in direct objects is not restricted.

Weakness: CWE-674

Which versions are affected by CVE-2018-9918?

It affects 2 products.

Products include Canonical Ubuntu Linux, Qpdf Project Qpdf.

How do I fix CVE-2018-9918?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-9918 being exploited?

There is no known exploitation of CVE-2018-9918 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-2018-9918, GHSA-mcgj-mgj8-8cr3, MGASA-2018-0232, SUSE-SU-2024:2173-1, UBUNTU-CVE-2018-9918.