CVE-2020-7062 Null Pointer Dereference in PHP Session Upload Progress

What is CVE-2020-7062?

CVE-2020-7062 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 27 Feb 2020. 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 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when using file upload functionality, if upload progress tracking is enabled, but session.upload_progress.cleanup is set to 0 (disabled), and the file upload fails, the upload procedure would try to clean up data that does not exist and encounter null pointer dereference, which would likely lead to a crash.

Weakness: CWE-476

Which versions are affected by CVE-2020-7062?

3 open source packages ship an affected version, including libphp, php and php-min. It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Opensuse Leap, Php Php.

How do I fix CVE-2020-7062?

Upgrade libphp to a fixed version for your release line: 7.2.28, 7.3.15 or 7.4.3.

Is CVE-2020-7062 being exploited?

There is no known exploitation of CVE-2020-7062 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 BIT-libphp-2020-7062, BIT-php-2020-7062, BIT-php-min-2020-7062, DEBIAN-CVE-2020-7062, GHSA-rrwc-c46p-f3v6, UBUNTU-CVE-2020-7062.