CVE-2023-3748 Inifinite loop in babld message parsing may cause dos

What is CVE-2023-3748?

CVE-2023-3748 is a low-severity denial of service vulnerability in Fedora, published on 24 Jul 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in FRRouting when parsing certain babeld unicast hello messages that are intended to be ignored. This issue may allow an attacker to send specially crafted hello messages with the unicast flag set, the interval field set to 0, or any TLV that contains a sub-TLV with the Mandatory flag set to enter an infinite loop and cause a denial of service.

Weakness: CWE-835

Which versions are affected by CVE-2023-3748?

It affects 1 product.

Products include Frrouting Frrouting.

How do I fix CVE-2023-3748?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-3748 being exploited?

There is no known exploitation of CVE-2023-3748 in the wild and no public exploit code.

Other vulnerabilities in Fedora

• CVE-2024-44070 Denial of service in n/a Critical 9.8
• CVE-2023-38406 bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow." Critical 9.8
• CVE-2022-37035 Use after free in n/a High 8.1
• CVE-2022-26127 Memory corruption in FRRouting High 7.8
• CVE-2022-26128 Memory corruption in FRRouting High 7.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-3748, GHSA-w8cg-4xhg-9fgw.