PT-2022-7560 · Isc+8 · Isc Dhcp+8
Victorv
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Published
2022-09-28
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Updated
2024-06-15
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CVE-2022-2928
CVSS v3.1
6.5
Medium
| Vector | AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
ISC DHCP versions 4.1-ESV-R1 through 4.1-ESV-R16-P1
ISC DHCP versions 4.4.0 through 4.4.3
Description
The issue is related to the function
add option() in ISC DHCP, which is used in server responses to lease query packets. When option code hash lookup() is called from add option(), it increases the option's refcount field, but there is no corresponding call to option dereference() to decrement the refcount field. This can cause the reference counters to overflow, leading to a server abort. The vulnerability can be exploited by a remote attacker to cause a denial of service.Recommendations
For ISC DHCP versions 4.1-ESV-R1 through 4.1-ESV-R16-P1, update to a version that includes a fix for the issue.
For ISC DHCP versions 4.4.0 through 4.4.3, update to a version that includes a fix for the issue.
As a temporary workaround, consider restricting access to the
add option() function to minimize the risk of exploitation.Fix
NULL Pointer Dereference
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Centos
Isc Dhcp
Linuxmint
Red Hat
Suse
Ubuntu