CVE-2021-43173
Routinator RRDP Slow-Drip Denial of Service
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.
INFO
Published Date :
Nov. 9, 2021, 5:15 p.m.
Last Modified :
Aug. 9, 2022, 1:42 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-43173.
| URL | Resource |
|---|---|
| https://www.debian.org/security/2021/dsa-5033 | Third Party Advisory |
| https://www.debian.org/security/2022/dsa-5041 | Third Party Advisory |
| https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt | Vendor Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-43173 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-43173 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Aug. 09, 2022
Action Type Old Value New Value Removed CWE NIST CWE-755 Added CWE NIST CWE-400 -
Modified Analysis by [email protected]
Apr. 01, 2022
Action Type Old Value New Value Changed Reference Type https://www.debian.org/security/2021/dsa-5033 No Types Assigned https://www.debian.org/security/2021/dsa-5033 Third Party Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5041 No Types Assigned https://www.debian.org/security/2022/dsa-5041 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jan. 12, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5041 [No Types Assigned] -
CVE Modified by [email protected]
Dec. 31, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-5033 [No Types Assigned] -
Initial Analysis by [email protected]
Nov. 12, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Changed Reference Type https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt No Types Assigned https://www.nlnetlabs.nl/downloads/routinator/CVE-2021-43172_CVE-2021-43173_CVE-2021-43174.txt Vendor Advisory Added CWE NIST CWE-755 Added CPE Configuration OR *cpe:2.3:a:nlnetlabs:routinator:*:*:*:*:*:*:*:* versions up to (excluding) 0.10.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-43173 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-43173
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.17 }} 0.05%
score
0.54909
percentile