CVE-2022-25218
published 2022-03-10CVE-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…
PriorityP350high8.1CVSS 3.1
AVNACHPRNUINSUCHIHAH
EPSS
0.98%
57.7th percentile
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
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| phicomm | k2_firmware | <= 22.5.9.163 | — |
| phicomm | k2g_firmware | <= 22.6.3.20 | — |
| phicomm | k2p_firmware | <= 20.4.1.7 | — |
| phicomm | k3_firmware | <= 21.5.37.246 | — |
| phicomm | k3c_firmware | <= 32.1.15.93 | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.09.3CRITICALAV:N/AC:M/Au:N/C:C/I:C/A:C
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GHSA
GHSA-vh93-7ch4-7jjr: 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 all
ghsa_unreviewed·2022-03-11·CVSS 8.1
CVE-2022-25219 [HIGH] CWE-436 GHSA-vh93-7ch4-7jjr: 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 all
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).
GHSA
GHSA-j9f3-j4r5-j83v: The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup, allows an unauthenticated attacker on the local area netwo
ghsa_unreviewed·2022-03-11·CVSS 8.4
CVE-2022-25218 [HIGH] GHSA-j9f3-j4r5-j83v: The use of the RSA algorithm without OAEP, or any other padding scheme, in telnetd_startup, allows an unauthenticated attacker on the local area netwo
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).
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2022-03-10
Published