CVE-2019-3823 Memory corruption in curl

What is CVE-2019-3823?

CVE-2019-3823 is a medium-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 6 Feb 2019. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

libcurl versions from 7.34.0 to before 7.64.0 are vulnerable to a heap out-of-bounds read in the code handling the end-of-response for SMTP. If the buffer passed to `smtp_endofresp()` isn't NUL terminated and contains no character ending the parsed number, and `len` is set to 5, then the `strtol()` call reads beyond the allocated buffer. The read contents will not be returned to the caller.

Weakness: CWE-125

Which versions are affected by CVE-2019-3823?

It affects 7 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Haxx Libcurl, Netapp Clustered Data Ontap, Oracle Communications Operations Monitor, Oracle Http Server and 1 more.

How do I fix CVE-2019-3823?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-3823 being exploited?

There is no known exploitation of CVE-2019-3823 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 ALPINE-CVE-2019-3823, CLEANSTART-2026-PX12484, CURL-CVE-2019-3823, DEBIAN-CVE-2019-3823, GHSA-xmjh-hmw3-hqhr, UBUNTU-CVE-2019-3823.