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CURL-CVE-2018-0500
No affected components available
curl might overflow a heap based memory buffer when sending data over SMTP and using a reduced read buffer.
When sending data over SMTP, curl allocates a separate "scratch area" on the heap to be able to escape the uploaded data properly if the uploaded data contains data that requires it.
The size of this temporary scratch area was mistakenly made to be 2 * sizeof(download_buffer) when it should have been made 2 * sizeof(upload_buffer).
The upload and the download buffer sizes are identically sized by default
(16KB) but since version 7.54.1, curl can resize the download buffer into a
smaller buffer (as well as larger). If the download buffer size is set to a
value smaller than 10923, the Curl_smtp_escape_eob() function might overflow
the scratch buffer when sending contents of sufficient size and contents.
The curl command line tool lowers the buffer size when --limit-rate is set
to a value smaller than 16KB.
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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