Bug 905882 (CVE-2022-40302, CVE-2022-40318, CVE-2022-43681) – net-misc/frr: multiple vulnerabilities

• Product: Gentoo Security
• Status: CONFIRMED ---

[Description John Helmert III 2023-05-07 16:09:44 UTC]

CVE-2022-43681 (https://forescout.com):

An out-of-bounds read exists in the BGP daemon of FRRouting FRR through 8.4. When sending a malformed BGP OPEN message that ends with the option length octet (or the option length word, in case of an extended OPEN message), the FRR code reads of out of the bounds of the packet, throwing a SIGABRT signal and exiting. This results in a bgpd daemon restart, causing a Denial-of-Service condition.

CVE-2022-40302 (https://github.com/FRRouting/frr/releases):

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.

CVE-2022-40318 (https://github.com/FRRouting/frr/releases):

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.

The first CVE's reference is obviously advertising, not clear based on
the other references where the fixes are.