Detections
Analytics
FreeBSD : isc-dhcp -- multiple vulnerabilities (c7fa3618-d5ff-11e1-90a2-000c299b62e1)
medium Nessus Plugin ID 60115
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Synopsis
The remote FreeBSD host is missing one or more security-related updates.Description
ISC reports :An unexpected client identifier parameter can cause the ISC DHCP daemon to segmentation fault when running in DHCPv6 mode, resulting in a denial of service to further client requests. In order to exploit this condition, an attacker must be able to send requests to the DHCP server.
An error in the handling of malformed client identifiers can cause a DHCP server running affected versions (see 'Impact') to enter a state where further client requests are not processed and the server process loops endlessly, consuming all available CPU cycles. Under normal circumstances this condition should not be triggered, but a non-conforming or malicious client could deliberately trigger it in a vulnerable server. In order to exploit this condition an attacker must be able to send requests to the DHCP server.
Two memory leaks have been found and fixed in ISC DHCP. Both are reproducible when running in DHCPv6 mode (with the -6 command-line argument.) The first leak is confirmed to only affect servers operating in DHCPv6 mode, but based on initial code analysis the second may theoretically affect DHCPv4 servers (though this has not been demonstrated.)
Solution
Update the affected packages.See Also
https://kb.isc.org/docs/aa-00714
https://kb.isc.org/docs/aa-00712
Plugin Details
Severity: Medium
ID: 60115
File Name: freebsd_pkg_c7fa3618d5ff11e190a2000c299b62e1.nasl
Version: 1.8
Type: local
Family: FreeBSD Local Security Checks
Published: 7/25/2012
Updated: 1/6/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C
Vulnerability Information
CPE: p-cpe:/a:freebsd:freebsd:isc-dhcp41-server, p-cpe:/a:freebsd:freebsd:isc-dhcp42-server, cpe:/o:freebsd:freebsd
Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info
Patch Publication Date: 7/25/2012
Vulnerability Publication Date: 7/24/2012