Heap out-of-bounds read in libcurl - CVE-2019-3823

Detailed vulnerability description

The vulnerability allows a remote attacker to gain access to potentially sensitive information or cause the service to crash.

The vulnerability exists due 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. A remote attacker can trigger heap out-of-bounds read error and read contents of memory on the system or cause the service to crash..

How to mitigate CVE-2019-3823

Sources

• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3823
• https://curl.haxx.se/docs/CVE-2019-3823.html