CVE-2019-11044 link() silently truncates after a null byte on Windows

What is CVE-2019-11044?

CVE-2019-11044 is a low-severity path traversal vulnerability in Fedoraproject Fedora, 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 on Windows, PHP link() function 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-170

Which versions are affected by CVE-2019-11044?

It affects 3 products.

Products include Fedoraproject Fedora, Php Php, Tenable Security Center.

How do I fix CVE-2019-11044?

No fix has been published for CVE-2019-11044 yet. Limit exposure of the affected software until one is available.

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

Is CVE-2019-11044 being exploited?

There is no known exploitation of CVE-2019-11044 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

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

Also known as GHSA-c8cf-pj9v-fcr9.