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Curl Library's Vulnerability: An Overview


The curl library, libcurl, faces a heap-based buffer overflow during a SOCKS5 proxy handshake due to a flaw.

Technical Breakdown

Trigger Mechanisms

  1. Use of the options CURLOPT_PROXYTYPE set to CURLPROXY_SOCKS5_HOSTNAME.
  2. Using CURLOPT_PROXY or CURLOPT_PRE_PROXY with the socks5h:// scheme.
  3. Setting environment variables like http_proxy, HTTPS_PROXY, or ALL_PROXY to the socks5h:// scheme.

Historical Context

CVE Classification

Impact

Solution

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About this post

Posted: 2023-10-13
By: dwirch
Viewed: 220 times

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