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Advisories

strongSwan 4.5.0 < 6.0.5 EAP-TTLS AVP Parsing Integer Underflow

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severity
high
date
Affecting

  • strongSwan 4.5.0 < 6.0.5

CWE
  • CWE-191 Integer Underflow (Wrap or Wraparound)
  • CWE-476 NULL Pointer Dereference
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.
Description
strongSwan versions 4.5.0 prior to 6.0.5 contain an integer underflow vulnerability in the EAP-TTLS AVP parser that allows unauthenticated remote attackers to cause a denial of service by sending crafted AVP data with invalid length fields during IKEv2 authentication. Attackers can exploit the failure to validate AVP length fields before subtraction to trigger excessive memory allocation or NULL pointer dereference, crashing the charon IKE daemon.

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