CVE-2017-13084

Wi-Fi Protected Access (WPA and WPA2) allows reinstallation of the Station-To-Station-Link (STSL) Transient Key (STK) during the PeerKey handshake, allowing an attacker within radio range to replay, decrypt, or spoof frames.

Weakness

The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

Affected Software

Potential Mitigations

• Use a well-vetted algorithm that is currently considered to be strong by experts in the field, and select well-tested implementations with adequate length seeds.
• In general, if a pseudo-random number generator is not advertised as being cryptographically secure, then it is probably a statistical PRNG and should not be used in security-sensitive contexts.
• Pseudo-random number generators can produce predictable numbers if the generator is known and the seed can be guessed. A 256-bit seed is a good starting point for producing a “random enough” number.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/112.html
• https://cwe.mitre.org/data/definitions/485.html
• https://cwe.mitre.org/data/definitions/59.html

References

• http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2017-007.txt
• http://www.kb.cert.org/vuls/id/228519
• http://www.securityfocus.com/bid/101274
• http://www.securitytracker.com/id/1039576
• http://www.securitytracker.com/id/1039577
• http://www.securitytracker.com/id/1039581
• https://access.redhat.com/security/vulnerabilities/kracks
• https://cert-portal.siemens.com/productcert/pdf/ssa-901333.pdf
• https://security.gentoo.org/glsa/201711-03
• https://support.lenovo.com/us/en/product_security/LEN-17420
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171016-wpa
• https://w1.fi/security/2017-1/wpa-packet-number-reuse-with-replayed-messages.txt
• https://www.krackattacks.com/