Summary
The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.
Security Fix(es):
* dhcp: option refcount overflow when leasequery is enabled leading to dhcpd abort (CVE-2022-2928)
* dhcp: DHCP memory leak (CVE-2022-2929)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.
Fixed packages 5
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | dhcp-client | 12:4.3.6-49.el8 |
| AlmaLinux · 8 | dhcp-common | 12:4.3.6-49.el8 |
| AlmaLinux · 8 | dhcp-libs | 12:4.3.6-49.el8 |
| AlmaLinux · 8 | dhcp-relay | 12:4.3.6-49.el8 |
| AlmaLinux · 8 | dhcp-server | 12:4.3.6-49.el8 |
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.