CVE-2020-26262
"Coturn Loopback Security Bypass"
Description
Coturn is free open source implementation of TURN and STUN Server. Coturn before version 4.5.2 by default does not allow peers to connect and relay packets to loopback addresses in the range of `127.x.x.x`. However, it was observed that when sending a `CONNECT` request with the `XOR-PEER-ADDRESS` value of `0.0.0.0`, a successful response was received and subsequently, `CONNECTIONBIND` also received a successful response. Coturn then is able to relay packets to the loopback interface. Additionally, when coturn is listening on IPv6, which is default, the loopback interface can also be reached by making use of either `[::1]` or `[::]` as the peer address. By using the address `0.0.0.0` as the peer address, a malicious user will be able to relay packets to the loopback interface, unless `--denied-peer-ip=0.0.0.0` (or similar) has been specified. Since the default configuration implies that loopback peers are not allowed, coturn administrators may choose to not set the `denied-peer-ip` setting. The issue patched in version 4.5.2. As a workaround the addresses in the address block `0.0.0.0/8`, `[::1]` and `[::]` should be denied by default unless `--allow-loopback-peers` has been specified.
INFO
Published Date :
Jan. 13, 2021, 7:15 p.m.
Last Modified :
Nov. 7, 2023, 3:20 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.7
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-2020-26262.
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-2020-26262 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26262 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 -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ [No types assigned] Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ [No types assigned] Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ -
Modified Analysis by [email protected]
Jan. 01, 2022
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jan. 20, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/ [No Types Assigned] -
Initial Analysis by [email protected]
Jan. 19, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N Changed Reference Type https://github.com/coturn/coturn/blob/57180ab60afcaeb13537e69ae8cb8aefd8f3f546/ChangeLog#L48 No Types Assigned https://github.com/coturn/coturn/blob/57180ab60afcaeb13537e69ae8cb8aefd8f3f546/ChangeLog#L48 Release Notes, Third Party Advisory Changed Reference Type https://github.com/coturn/coturn/commit/abfe1fd08d78baa0947d17dac0f7411c3d948e4d No Types Assigned https://github.com/coturn/coturn/commit/abfe1fd08d78baa0947d17dac0f7411c3d948e4d Patch, Third Party Advisory Changed Reference Type https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7p No Types Assigned https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7p Exploit, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:coturn_project:coturn:*:*:*:*:*:*:*:* versions up to (excluding) 4.5.2
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26262 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-2020-26262
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.19 }} 0.04%
score
0.56508
percentile