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8.8 High

CVE-2023-38545 This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake

Description

This flaw makes curl overflow a heap based buffer in the SOCKS5 proxy handshake. When curl is asked to pass along the host name to the SOCKS5 proxy to allow that to resolve the address instead of it getting done by curl itself, the maximum length that host name can be is 255 bytes. If the host name is detected to be longer, curl switches to local name resolving and instead passes on the resolved address only. Due to this bug, the local variable that means "let the host resolve the name" could get the wrong value during a slow SOCKS5 handshake, and contrary to the intention, copy the too long host name to the target buffer instead of copying just the resolved address there. The target buffer being a heap based buffer, and the host name coming from the URL that curl has been told to operate with.

Affected products and versions

Product Affected versions Fixed in
curl 8.4 earliest → < 8.4.0 8.4.0
curl 7.69 earliest → < 7.69.0 7.69.0
RUGGEDCOM APE1808 Versions not published
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.5 → latest No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.5 → latest No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.5 → latest No fix stated

References

Timeline

  1. Published
  2. Last modified

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