CVE-2019-11046 Buffer underflow in bc_shift_addsub

What is CVE-2019-11046?

CVE-2019-11046 is a low-severity 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 bcmath extension functions on some systems, including Windows, can be tricked into reading beyond the allocated space by supplying it with string containing characters that are identified as numeric by the OS but aren't ASCII numbers. This can read to disclosure of the content of some memory locations.

Weakness: CWE-125

Which versions are affected by CVE-2019-11046?

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-2019-11046?

Upgrade to a fixed version.

Is CVE-2019-11046 being exploited?

There is no known exploitation of CVE-2019-11046 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-6c5q-qpjx-9564, UBUNTU-CVE-2019-11046.