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>=4.4.0<=4.4.3
ISC DHCP=4.1-esv-r1
ISC DHCP=4.1-esv-r10
ISC DHCP=4.1-esv-r10_b1
ISC DHCP=4.1-esv-r10_rc1
ISC DHCP=4.1-esv-r10b1
ISC DHCP=4.1-esv-r10rc1
ISC DHCP=4.1-esv-r11
ISC DHCP=4.1-esv-r11_b1
ISC DHCP=4.1-esv-r11_rc1
ISC DHCP=4.1-esv-r11_rc2
ISC DHCP=4.1-esv-r11b1
ISC DHCP=4.1-esv-r11rc1
ISC DHCP=4.1-esv-r11rc2
ISC DHCP=4.1-esv-r12
ISC DHCP=4.1-esv-r12-p1
ISC DHCP=4.1-esv-r12_b1
ISC DHCP=4.1-esv-r12_p1
ISC DHCP=4.1-esv-r12b1
ISC DHCP=4.1-esv-r13
ISC DHCP=4.1-esv-r13_b1
ISC DHCP=4.1-esv-r13b1
ISC DHCP=4.1-esv-r14
ISC DHCP=4.1-esv-r14_b1
ISC DHCP=4.1-esv-r14b1
ISC DHCP=4.1-esv-r15
ISC DHCP=4.1-esv-r15-p1
ISC DHCP=4.1-esv-r15_b1
ISC DHCP=4.1-esv-r16
ISC DHCP=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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