Integer Overflow or Wraparound Affecting dhcp-libs package, versions *



    Attack Complexity Low
    Availability High
Expand this section
6.5 medium
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Red Hat
6.5 medium
Expand this section
6.5 medium

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  • published 6 Oct 2022
  • disclosed 5 Oct 2022

How to fix?

There is no fixed version for Centos:8 dhcp-libs.

NVD Description

Note: Versions mentioned in the description apply only to the upstream dhcp-libs package and not the dhcp-libs package as distributed by Centos:8. See How to fix? for Centos:8 relevant fixed versions and status.

In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() 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 function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.