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Advisories

snap7 through 1.4.3 Out-of-Bounds Write via TSnap7MicroClient::opReadArea

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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
Mayur021, Shukhratbek Uraiimov
Description
snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, crashing SCADA, HMI, or gateway processes and corrupting memory.

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