CVE-2022-2928

Public on 2022-10-07
Modified on 2022-10-27
Description

An integer overflow vulnerability was found in the DHCP server. When the "option_code_hash_lookup()" function is called from "add_option()", it increases the option's "refcount" field. However, there is not a corresponding call to "option_dereference()" to decrement the "refcount" field. The "add_option()" function is only used in server responses to lease query packets. Each lease query response calls this function for several options. Hence, a DHCP server configured with "allow lease query" a remote machine with access to the server, can send lease queries for the same lease multiple times, leading to the "add_option()" function being called repeatedly. This issue could cause the reference counters to overflow and the server to abort or crash.

Severity
Medium
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CVSS v3 Base Score
6.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core dhcp 2022-10-31 19:40 ALAS2-2022-1874

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVSSv3 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H