CVE-2018-0500

Source
Severity High
Remote Yes
Type Arbitrary code execution
Description
It has been discovered that curl before 7.61.0 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.
Group Package Affected Fixed Severity Status Ticket
AVG-734 libcurl-gnutls 7.60.0-1 7.61.0-1 High Fixed
AVG-733 libcurl-compat 7.60.0-1 7.61.0-1 High Fixed
AVG-732 lib32-libcurl-gnutls 7.60.0-1 7.61.0-1 High Fixed
AVG-731 lib32-libcurl-compat 7.60.0-1 7.61.0-1 High Fixed
AVG-730 lib32-curl 7.60.0-1 7.61.0-1 High Fixed
AVG-729 curl 7.60.0-1 7.61.0-1 High Fixed
References
https://curl.haxx.se/docs/adv_2018-70a2.html