SynopsisA remotely exploitable Integer Overflow or Wraparound or Uncontrolled Resource Consumption vulnerability has been identified in Siemens CM, CP, SIMATIC, SINUMERIK, SINAMICS, SCALANCE, and TIM.
DescriptionThe kernel of the listed devices is affected by an integer overflow when handling TCP Selective Acknowledgements, which could allow a remote attacker to cause a denial-of-service condition. Also, a remote attacker sending specially crafted TCP Selective Acknowledgment (SACK) sequences may cause a denial-of-service condition. And, finally, an attacker may exploit a vulnerability in the TCP retransmission queue when handling SACK to cause a denial-of-service condition.
SolutionPerform vendor recommended mitigations and apply available vendor upgrades.