Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2022-25218

Severity CVSS v4.0:
Pending analysis
Type:
CWE-327 Use of a Broken or Risky Cryptographic Algorithm
Publication date:
10/03/2022
Last modified:
08/08/2023

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).

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.10 HIGH
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.10
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 9.30 HIGH
Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C

Attack Vector (AV): Network
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
9.30
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:phicomm:k2_firmware:*:*:*:*:*:*:*:* 22.5.9.163 (including)
cpe:2.3:h:phicomm:k2:-:*:*:*:*:*:*:*
cpe:2.3:o:phicomm:k3_firmware:*:*:*:*:*:*:*:* 21.5.37.246 (including)
cpe:2.3:h:phicomm:k3:-:*:*:*:*:*:*:*
cpe:2.3:o:phicomm:k3c_firmware:*:*:*:*:*:*:*:* 32.1.15.93 (including)
cpe:2.3:h:phicomm:k3c:-:*:*:*:*:*:*:*
cpe:2.3:o:phicomm:k2g_firmware:*:*:*:*:*:*:*:* 22.6.3.20 (including)
cpe:2.3:h:phicomm:k2g:-:*:*:*:*:*:*:*
cpe:2.3:o:phicomm:k2p_firmware:*:*:*:*:*:*:*:* 20.4.1.7 (including)
cpe:2.3:h:phicomm:k2p:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools