CVE-2021-43173 Information

Description

In NLnet Labs Routinator prior to 0.10.2 a validation run can be delayed significantly by an RRDP repository by not answering but slowly drip-feeding bytes to keep the connection alive. This can be used to effectively stall validation. While Routinator has a configurable time-out value for RRDP connections this time-out was only applied to individual read or write operations rather than the complete request. Thus if an RRDP repository sends a little bit of data before that time-out expired it can continuously extend the time it takes for the request to finish. Since validation will only continue once the update of an RRDP repository has concluded this delay will cause validation to stall leading to Routinator continuing to serve the old data set or if in the initial validation run directly after starting never serve any data at all.

CVSS Vector

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

Reference

https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt https://www.debian.org/security/2021/dsa-5033 https://www.debian.org/security/2022/dsa-5041

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.5