A null byte interaction error has been discovered in the code that the telnetd_startup daemon uses to construct a pair of ephemeral passwords that allow a user to spawn a telnet service on the router, and to ensure that the telnet service persists upon reboot. By means of a crafted exchange of UDP packets, an unauthenticated attacker on the local network can leverage this null byte interaction error in such a way as to make those ephemeral passwords predictable (with 1-in-94 odds). Since the attacker must manipulate data processed by the OpenSSL function RSA_public_decrypt(), successful exploitation of this vulnerability depends on the use of an unpadded RSA cipher (CVE-2022-25218).
History

No history.

cve-icon MITRE

Status: PUBLISHED

Assigner: tenable

Published: 2022-03-07T21:56:51

Updated: 2024-08-03T04:36:05.791Z

Reserved: 2022-02-15T00:00:00

Link: CVE-2022-25219

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2022-03-10T17:47:02.457

Modified: 2023-08-08T14:22:24.967

Link: CVE-2022-25219

cve-icon Redhat

No data.