CVE-2022-25218

The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup, allows an unauthenticated attacker on the local area network to achieve a significant degree of control over the "plaintext" to which an arbitrary blob of ciphertext will be decrypted by OpenSSL's RSA_public_decrypt() function. This weakness allows the attacker to manipulate the various iterations of the telnetd startup state machine and eventually obtain a root shell on the device, by means of an exchange of crafted UDP packets. In all versions but K2 22.5.9.163 and K3C 32.1.15.93 a successful attack also requires the exploitation of a null-byte interaction error (CVE-2022-25219).

• phicomm k2 firmware (<= 22.5.9.163) • phicomm k3 firmware (<= 21.5.37.246) • phicomm k3c firmware (<= 32.1.15.93) • phicomm k2g firmware (<= 22.6.3.20) • phicomm k2p firmware (<= 20.4.1.7)