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 ach…
Impact
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).
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Phicomm | K2 Firmware | through 22.5.9.163 |
| Phicomm | K3 Firmware | through 21.5.37.246 |
| Phicomm | K3c Firmware | through 32.1.15.93 |
| Phicomm | K2g Firmware | through 22.6.3.20 |
| Phicomm | K2p Firmware | through 20.4.1.7 |