Heap Out-of-Bounds Read in libcurl SMTP End-of-Response Handling

Heap Out-of-Bounds Read in libcurl SMTP End-of-Response Handling

CVE-2019-3823 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

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.

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