CVE-2022-2928 An option refcount overflow exists in dhcpd

2022-10-0700:00:00

isc

www.cve.org

cve-2022-2928 isc dhcp

option refcount overflow

add_option

6.5 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

43.7%

JSON

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.

CNA Affected

[
  {
    "vendor": "ISC",
    "product": "ISC DHCP",
    "versions": [
      {
        "version": "4.4.0 through versions before 4.4.3-P1",
        "status": "affected"
      },
      {
        "version": "4.1 ESV 4.1-ESV-R1 through versions before 4.1-ESV-R16-P1",
        "status": "affected"
      }
    ]
  }
]