CVE-2017-18187: arm mbed_tls Integer Overflow or Wraparound

Vulnerability summary

CVE-2017-18187 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in arm mbed_tls. EPSS estimates a 3.12% chance of exploitation in the next 30 days, higher than 87.6% of scored vulnerabilities.

Timeline

1. 14-02-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

In ARM mbed TLS before 2.7.0, there is a bounds-check bypass through an integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.