Summary
It was discovered that DHCP incorrectly handled option reference counting.
A remote attacker could possibly use this issue to cause DHCP servers to
crash, resulting in a denial of service. (CVE-2022-2928)
It was discovered that DHCP incorrectly handled certain memory operations.
A remote attacker could possibly use this issue to cause DHCP clients and
servers to consume resources, leading to a denial of service.
(CVE-2022-2929)
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Ubuntu · 18.04 LTS 18.04:LTS | isc-dhcp | 4.3.5-3ubuntu7.4 |
| Ubuntu · 20.04 LTS 20.04:LTS | isc-dhcp | 4.4.1-2.1ubuntu5.20.04.4 |
| Ubuntu · 22.04 LTS 22.04:LTS | isc-dhcp | 4.4.1-2.3ubuntu2.3 |
Vulnerabilities 2
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Medium 6.5
An option refcount overflow exists in dhcpd
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 decreme…
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Medium 6.5
DHCP memory leak
In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory.