title: Inifinite loop in babld message parsing may cause dos
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.
problem types: Loop with Unreachable Exit Condition ('Infinite Loop')
affected:
{
product: frr
vendor: n/a
versions:
version: 8.5, status: unaffected
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 8
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: frr
defaultStatus: unaffected
cpes: cpe:/o:redhat:enterprise_linux:8
}
{
vendor: Red Hat
product: Red Hat Enterprise Linux 9
collectionURL: https://access.redhat.com/downloads/content/package-browser/
packageName: frr
defaultStatus: unaffected
cpes: cpe:/o:redhat:enterprise_linux:9
}
{
product: Fedora
vendor: Fedora
collectionURL: https://packages.fedoraproject.org/
packageName: frr
defaultStatus: unaffected
}
metrics:
other: [
content: {'value': 'Low', 'namespace': 'https://access.redhat.com/security/updates/classification/'}
type: Red Hat severity rating
]