Description

Open Shortest Path First (OSPF) protocol implementations may improperly determine Link State Advertisement (LSA) recency for LSAs with MaxSequenceNumber. According to RFC 2328 section 13.1, for two instances of the same LSA, recency is determined by first comparing sequence numbers, then checksums, and finally MaxAge. In a case where the sequence numbers are the same, the LSA with the larger checksum is considered more recent, and will not be flushed from the Link State Database (LSDB). Since the RFC does not explicitly state that the values of links carried by a LSA must be the same when prematurely aging a self-originating LSA with MaxSequenceNumber, it is possible in vulnerable OSPF implementations for an attacker to craft a LSA with MaxSequenceNumber and invalid links that will result in a larger checksum and thus a 'newer' LSA that will not be flushed from the LSDB. Propagation of the crafted LSA can result in the erasure or alteration of the routing tables of routers within the routing domain, creating a denial of service condition or the re-routing of traffic on the network. CVE-2017-3224 has been reserved for Quagga and downstream implementations (SUSE, openSUSE, and Red Hat packages).

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  8.2 HIGH

Vector:  CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score:  4.3 MEDIUM

Vector:  (AV:A/AC:M/Au:N/C:N/I:P/A:P)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://www.kb.cert.org/vuls/id/793496	Third Party Advisory  US Government Resource

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-345	Insufficient Verification of Data Authenticity	NIST
CWE-354	Improper Validation of Integrity Check Value	CERT/CC

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Change History

3 change records found show changes

CVE Modified by CERT/CC 5/14/2024 12:38:05 AM

Action	Type	Old Value	New Value

CVE Modified by CERT/CC 10/09/2019 7:27:25 PM

Action	Type	Old Value	New Value
Added	CWE		CERT/CC CWE-354

Initial Analysis by NIST 10/04/2018 10:57:36 AM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:quagga:quagga:-:*:*:*:*:*:*:*
Added	CPE Configuration		OR *cpe:2.3:a:redhat:package_manager:-:*:*:*:*:*:*:*
Added	CPE Configuration		OR *cpe:2.3:o:suse:opensuse:-:*:*:*:*:*:*:* *cpe:2.3:o:suse:suse_linux:-:*:*:*:*:*:*:*
Added	CVSS V2		(AV:A/AC:M/Au:N/C:N/I:P/A:P)
Added	CVSS V3		AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:H
Added	CWE		CWE-345
Changed	Reference Type	https://www.kb.cert.org/vuls/id/793496 No Types Assigned	https://www.kb.cert.org/vuls/id/793496 Third Party Advisory, US Government Resource