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Advisories

Snap7 through 1.4.3 Out-of-Bounds Write via BRecv and CheckAsBRecvCompletion

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Severity
high
Date
Affecting

  • snap7 <= 1.4.3

CWE
  • CWE-787 Out-of-bounds Write
CVSS
8.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Telmo Xavier
Description
Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.

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