CVE-2018-5709: mit kerberos Integer Overflow or Wraparound

Vulnerability summary

CVE-2018-5709 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in mit kerberos. EPSS estimates a 2.05% chance of exploitation in the next 30 days, higher than 80.9% of scored vulnerabilities.

Timeline

1. 16-01-2018
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.

• 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.