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3 vulnerabilities by coturn

CVE-2025-69217 (GCVE-0-2025-69217)

Vulnerability from cvelistv5 – Published: 2025-12-30 00:41 – Updated: 2025-12-30 15:57
VLAI?
Title
Coturn has unsafe nonce and relay port randomization due to weak random number generation.
Summary
coturn is a free open source implementation of TURN and STUN Server. Versions 4.6.2r5 through 4.7.0-r4 have a bad random number generator for nonces and port randomization after refactoring. Additionally, random numbers aren't generated with openssl's RAND_bytes but libc's random() (if it's not running on Windows). When fetching about 50 sequential nonces (i.e., through sending 50 unauthenticated allocations requests) it is possible to completely reconstruct the current state of the random number generator, thereby predicting the next nonce. This allows authentication while spoofing IPs. An attacker can send authenticated messages without ever receiving the responses, including the nonce (requires knowledge of the credentials, which is e.g., often the case in IoT settings). Since the port randomization is deterministic given the pseudorandom seed, an attacker can exactly reconstruct the ports and, hence predict the randomization of the ports. If an attacker allocates a relay port, they know the current port, and they are able to predict the next relay port (at least if it is not used before). Commit 11fc465f4bba70bb0ad8aae17d6c4a63a29917d9 contains a fix.
Severity ?
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE
  • CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
Assigner
References
Impacted products
Vendor Product Version
coturn coturn Affected: >= 4.6.2r5, <= 4.7.0-r4
Create a notification for this product.
Show details on NVD website
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CVE-2020-26262 (GCVE-0-2020-26262)

Vulnerability from cvelistv5 – Published: 2021-01-13 18:15 – Updated: 2024-08-04 15:56
VLAI?
Title
Loopback bypass in Coturn
Summary
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.
Severity ?
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE
  • CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
  • CWE-682 - Incorrect Calculation
Assigner
References
Impacted products
Vendor Product Version
coturn coturn Affected: < 4.5.2
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-4067 (GCVE-0-2020-4067)

Vulnerability from cvelistv5 – Published: 2020-06-29 19:55 – Updated: 2024-08-04 07:52
VLAI?
Title
Improper Initialization in coturn
Summary
In coturn before version 4.5.1.3, there is an issue whereby STUN/TURN response buffer is not initialized properly. There is a leak of information between different client connections. One client (an attacker) could use their connection to intelligently query coturn to get interesting bytes in the padding bytes from the connection of another client. This has been fixed in 4.5.1.3.
Severity ?
7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
CWE
  • CWE-665 - Improper Initialization
Assigner
References
Impacted products
Vendor Product Version
coturn coturn Affected: >= 5.1.1, < 6.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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