RustDesk Client and Server Authentication Flaws

Static TLS fingerprint in Rakuten Viber Cloak mode enables tracking despite privacy mode.

Security vulnerability in RustDesk remote desktop client/server. One of 6+ critical CVEs affecting the open-source remote access platform.

Security vulnerability in RustDesk remote desktop client/server. One of 6+ critical CVEs affecting the open-source remote access platform.

Security vulnerability in RustDesk remote desktop client/server. One of 6+ critical CVEs affecting the open-source remote access platform.

Unauthenticated attackers can abuse missing authorization controls in RustDesk Server's rendezvous and relay modules (hbbs/hbbr) to gain unauthorized privileges through exposed critical functions like punch hole requests and peer registration. This vulnerability affects RustDesk Server versions through 1.7.5 and 1.1.15, enabling remote privilege escalation over the network with no authentication required. No patch is currently available.

RustDesk Server Pro through version 1.7.5 uses weak cryptographic algorithms in configuration string generation and web console export functions, enabling attackers to extract sensitive embedded data from exported configurations. This vulnerability affects Windows, macOS, and Linux deployments and requires no authentication or user interaction to exploit. No patch is currently available.

RustDesk Client through version 1.4.5 transmits sensitive preset address book credentials in cleartext during heartbeat synchronization, enabling network eavesdropping attacks across Windows, macOS, Linux, iOS, and Android platforms. An attacker positioned to intercept network traffic can capture authentication credentials by sniffing the unencrypted JSON payload. No patch is currently available for this high-severity vulnerability (CVSS 8.7).

Configuration tampering in RustDesk Client through 1.4.5 allows a network-positioned attacker to manipulate Application API messages exchanged between the client and its rendezvous/sync server, altering client strategy and configuration options. The flaw spans every supported platform (Windows, macOS, Linux, iOS, Android, WebClient) and stems from insecure handling in the Strategy merge loop and Config::set_options(), giving an MitM attacker the ability to silently rewrite client behavior. No public exploit identified at time of analysis, and EPSS exploitation probability is very low at 0.05% (16th percentile).

Password brute-forcing weakness in RustDesk Server Pro through 1.7.5 and RustDesk Server (OSS) through 1.1.15 allows remote attackers to attack the peer authentication and API login modules without triggering rate limiting, while the SHA256(SHA256(pwd+salt)+challenge) construction provides insufficient computational cost to resist offline guessing. The flaw combines CWE-307 (missing throttling of authentication attempts) with weak password hashing on Windows, macOS, and Linux deployments, and no public exploit has been identified at time of analysis.

Remote denial-of-service in RustDesk Client through 1.4.5 allows network-positioned attackers to disrupt the remote-access agent by manipulating heartbeat synchronization traffic, abusing weak authenticity checks in the hbbs_http/sync.rs heartbeat loop to trigger the stop-service handler. Publicly available exploit code exists, but EPSS is very low (0.02%, 5th percentile) and there is no public exploit identified at time of analysis being tracked as actively exploited (not in CISA KEV).

RustDesk Client through version 1.4.5 on Windows, macOS, and Linux uses weak password hashing and improper object prototype handling in its password security and configuration encryption modules, allowing local authenticated attackers to extract embedded sensitive data including passwords and machine identifiers. The vulnerability affects critical cryptographic functions including symmetric_crypt() and decrypt_str_or_original(), enabling attackers with local access and valid credentials to compromise encrypted credentials and system identifiers. No patch is currently available.

RustDesk Client through version 1.4.5 uses a broken cryptographic algorithm that allows attackers to retrieve sensitive embedded data during config import, URI scheme handling, or CLI operations across Windows, macOS, Linux, iOS, Android, and web clients. An unauthenticated remote attacker can exploit this vulnerability without user interaction to extract sensitive configuration information. No patch is currently available for this high-severity vulnerability.

RustDesk Server Pro through version 1.7.5 transmits sensitive address book credentials in cleartext over the network heartbeat synchronization API, enabling attackers to intercept and obtain authentication credentials without authentication. The vulnerability affects Windows, macOS, and Linux deployments where the address book sync functionality is enabled. No patch is currently available.

Authentication bypass in RustDesk Client through 1.4.5 across Windows, macOS, Linux, iOS, and Android allows remote attackers to replay captured session IDs and login proofs to impersonate legitimate peers without knowing the original credentials. The flaw stems from insufficient computational effort in the hash_password() routine combined with reusable session identifiers in the login proof construction, enabling capture-replay attacks against the peer authentication module. No public exploit identified at time of analysis, and EPSS exploitation probability is very low at 0.04% (12th percentile).

Privilege escalation in RustDesk Client through version 1.4.5 on Windows, macOS, Linux, iOS, and Android allows unauthenticated remote attackers to abuse API sync and configuration management functions. The vulnerability in the rendezvous mediator and HTTP sync modules enables attackers to gain elevated privileges without user interaction. No patch is currently available for affected users.