CVE-2018-11574: canonical ubuntu_linux Improper Input Validation

Vulnerability summary

CVE-2018-11574 is a critical (CVSS 9.8) Improper Input Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 1.87% chance of exploitation in the next 30 days, higher than 79.1% of scored vulnerabilities.

Timeline

1. 14-06-2018
   PublishedVulnerability first disclosed.
2. 03-12-2025
   Last modifiedVulnerability information updated.

Description

Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and includes the affected eap.c and eap-tls.c files. Configurations that use the `refuse-app` option are unaffected.

• CWE-20Improper Input ValidationThe product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
• 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.