CVE-2019-11045 DirectoryIterator class silently truncates after a null byte

What is CVE-2019-11045?

CVE-2019-11045 is a low-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 23 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0, PHP DirectoryIterator class accepts filenames with embedded \0 byte and treats them as terminating at that byte. This could lead to security vulnerabilities, e.g. in applications checking paths that the code is allowed to access.

Weakness: CWE-74, CWE-170

Which versions are affected by CVE-2019-11045?

It affects 6 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Php Php, Tenable Security Center.

How do I fix CVE-2019-11045?

Upgrade to a fixed version.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2019-11045 being exploited?

There is no known exploitation of CVE-2019-11045 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 GHSA-jv88-p4rw-4m4h, UBUNTU-CVE-2019-11045.