CVE-2022-40318

2023-05-0300:00:00

ubuntu.com

frrouting

bgpd

denial of service

bgp open message

extended length

rfc 9072

assertion failure

daemon restart

out-of-bounds read

inconsistent boundary checks

bgp_open_option_parse

cve-2022-40318

cve-2022-40302

cve-2022-43681

github

debian

mdeslaur

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

0.001 Low

EPSS

Percentile

39.5%

JSON

An issue was discovered in bgpd in FRRouting (FRR) through 8.4. By crafting
a BGP OPEN message with an option of type 0xff (Extended Length from RFC
9072), attackers may cause a denial of service (assertion failure and
daemon restart, or out-of-bounds read). This is possible because of
inconsistent boundary checks that do not account for reading 3 bytes
(instead of 2) in this 0xff case. NOTE: this behavior occurs in
bgp_open_option_parse in the bgp_open.c file, a different location (with a
different attack vector) relative to CVE-2022-40302.

Bugs

Notes

Author	Note
mdeslaur	Commits below fix CVE-2022-40302, CVE-2022-40318, CVE-2022-43681 Introduced by https://github.com/FRRouting/frr/commit/d08c0c8077fbb3e100ed2e87927edec1a09d224b