CVE-2016-4538 Denial of service in n/a

What is CVE-2016-4538?

CVE-2016-4538 is a critical denial of service vulnerability in Fedoraproject Fedora, published on 22 May 2016. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The bcpowmod function in ext/bcmath/bcmath.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 modifies certain data structures without considering whether they are copies of the _zero_, _one_, or _two_ global variable, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via a crafted call.

Weakness: CWE-20

Which versions are affected by CVE-2016-4538?

It affects 3 products.

Products include Fedoraproject Fedora, Opensuse Leap, Php Php.

How do I fix CVE-2016-4538?

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-2016-4538 being exploited?

There is no known exploitation of CVE-2016-4538 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-w758-w9qr-5vxq, UBUNTU-CVE-2016-4538.