CVE-2022-25218
Description
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).
Related CPE's
CvssV3 impact
BaseSeverity | HIGH |
ConfidentialityImpact | HIGH |
AttackComplexity | HIGH |
Scope | UNCHANGED |
AttackVector | NETWORK |
AvailabilityImpact | HIGH |
IntegrityImpact | HIGH |
PrivilegesRequired | NONE |
BaseScore | 8.1 |
VectorString | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Version | 3.1 |
UserInteraction | NONE |
CvssV2 impact
AccessComplexity | MEDIUM |
ConfidentialityImpact | COMPLETE |
AvailabilityImpact | COMPLETE |
IntegrityImpact | COMPLETE |
BaseScore | 9.3 |
VectorString | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Version | 2.0 |
AccessVector | NETWORK |
Authentication | NONE |