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Vulnerability Details : CVE-2020-26262

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.
Publish Date : 2021-01-13 Last Update Date : 2022-01-01
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- CVSS Scores & Vulnerability Types

CVSS Score
6.4
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 682

- Products Affected By CVE-2020-26262

# Product Type Vendor Product Version Update Edition Language
1 Application Coturn Project Coturn * * * * Version Details Vulnerabilities
2 OS Fedoraproject Fedora 32 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Coturn Project Coturn 1
Fedoraproject Fedora 2

- References For CVE-2020-26262

https://lists.fedoraproject.org/archives/list/[email protected]/message/M4CJOPAQT43MYAFU3UROGLEXN3Z6RS4H/
FEDORA FEDORA-2021-32d0068851
https://lists.fedoraproject.org/archives/list/[email protected]/message/G54UIUFTEC6RLPOISMB6FUW7456SBZC4/
FEDORA FEDORA-2021-dee141fc61
https://github.com/coturn/coturn/security/advisories/GHSA-6g6j-r9rf-cm7p CONFIRM
https://github.com/coturn/coturn/blob/57180ab60afcaeb13537e69ae8cb8aefd8f3f546/ChangeLog#L48
https://github.com/coturn/coturn/commit/abfe1fd08d78baa0947d17dac0f7411c3d948e4d

- Metasploit Modules Related To CVE-2020-26262

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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