medium
6.5
CWE
476
Advisory Published
Updated

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

First published: Fri Oct 07 2022(Updated: )

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.

Credit: security-officer@isc.org

Affected SoftwareAffected VersionHow to fix
ISC DHCP Server>=4.4.0<=4.4.3
ISC DHCP Server=4.1-esv-r1
ISC DHCP Server=4.1-esv-r10
ISC DHCP Server=4.1-esv-r10_b1
ISC DHCP Server=4.1-esv-r10_rc1
ISC DHCP Server=4.1-esv-r10b1
ISC DHCP Server=4.1-esv-r10rc1
ISC DHCP Server=4.1-esv-r11
ISC DHCP Server=4.1-esv-r11_b1
ISC DHCP Server=4.1-esv-r11_rc1
ISC DHCP Server=4.1-esv-r11_rc2
ISC DHCP Server=4.1-esv-r11b1
ISC DHCP Server=4.1-esv-r11rc1
ISC DHCP Server=4.1-esv-r11rc2
ISC DHCP Server=4.1-esv-r12
ISC DHCP Server=4.1-esv-r12-p1
ISC DHCP Server=4.1-esv-r12_b1
ISC DHCP Server=4.1-esv-r12_p1
ISC DHCP Server=4.1-esv-r12b1
ISC DHCP Server=4.1-esv-r13
ISC DHCP Server=4.1-esv-r13_b1
ISC DHCP Server=4.1-esv-r13b1
ISC DHCP Server=4.1-esv-r14
ISC DHCP Server=4.1-esv-r14_b1
ISC DHCP Server=4.1-esv-r14b1
ISC DHCP Server=4.1-esv-r15
ISC DHCP Server=4.1-esv-r15-p1
ISC DHCP Server=4.1-esv-r15_b1
ISC DHCP Server=4.1-esv-r16
ISC DHCP Server=4.1-esv-r16-p1
Debian Debian Linux=10.0
Fedoraproject Fedora=35
Fedoraproject Fedora=36
Fedoraproject Fedora=37

Remedy

Upgrade to the patched release most closely related to your current version of ISC DHCP. These can all be downloaded from https://www.isc.org/downloads. 4.4.3-P1 4.1-ESV-R16-P2

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2022-2928?

    The severity of CVE-2022-2928 is medium.

  • What is the affected software of CVE-2022-2928?

    The affected software of CVE-2022-2928 is ISC DHCP versions 4.4.0 to 4.4.3 and 4.1-ESV-R1 to 4.1-ESV-R16-P1.

  • How does CVE-2022-2928 impact ISC DHCP?

    CVE-2022-2928 increases the option's refcount field, but does not decrement it, leading to a vulnerability.

  • How can I fix CVE-2022-2928?

    To fix CVE-2022-2928, upgrade to a version of ISC DHCP that is not affected.

  • Where can I find more information about CVE-2022-2928?

    More information about CVE-2022-2928 can be found in the references provided.

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