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CVE-2022-25219

HIGHCVSS 8.4/10EPSS 0.76%

Last modified

CVE-2022-25219 is a high-severity vulnerability rated 8.4/10 on the CVSS scale. 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). EPSS estimates a 0.76% chance of exploitation in the next 30 days.

Description

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).

Metrics

CVSS 3.1
8.4/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.76%

50.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
PhicommK2 Firmware<= 22.5.9.163
PhicommK3 Firmware<= 21.5.37.246
PhicommK3c Firmware<= 32.1.15.93
PhicommK2g Firmware<= 22.6.3.20
PhicommK2p Firmware<= 20.4.1.7

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2022-25219?
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).
How severe is CVE-2022-25219?
CVE-2022-25219 has a CVSS score of 8.4/10 (HIGH severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.
How do I fix CVE-2022-25219?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-25219?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST