4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
56.5%
Visual Voice Mail (VVM) services transmit unencrypted credentials via SMS. An attacker with the ability to read SMS messages can obtain VVM IMAP credentials and gain access to VVM data.
VVM is specified by Open Mobile Terminal Platform-OMPT and is implemented with SMS and IMAP (and other protocols). VVM IMAP credentials are sent unencrypted in SMS messages. From vvm-disclosure:
> When a client sends any sort of STATUS SMS (activate, deactivate, status), the carrier will respond with all credentials needed to log into the IMAP server (i.e. username, password, server host-name).
From section 2.1.1.2 AUTHENTICATE of the OMTP VISUAL VOICEMAIL INTERFACE SPECIFICATION v1.3: “The IMAP4 password is sent in the STATUS SMS message.”
To intercept an SMS message, an attacker would need, for example: * temporary physical access to the SIM card, * to operate a spoofed a base station (cell tower), or * to convince a user to install a malicious application that has SMS access.
VVM IMAP services may be widely accessible over the internet or carrier networks.
From vvm-disclosure:
> There is no indication on to a victim that someone else has access to their VVM. Android leaves their VVMs on the IMAP server until the client deletes it, so any VVMs on the client are accessible to a malicious actor.
An attacker with the ability to read SMS messages can obtain VVM IMAP credentials and gain access to VVM data.
We are not aware of a practical solution to this vulnerability.
Take general precautions against SMS interception.
If supported, change your VMM password on some basis.
Delete VMM data quickly.
Thanks to Chris Talbot for researching and reporting this vulnerability.
This document was written by Brad Runyon.
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Notified: 2021-07-06 Updated: 2022-02-24 CVE-2022-23835 | Unknown |
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We have not received a statement from the vendor.
Notified: 2021-07-06 Updated: 2022-02-24 CVE-2022-23835 | Unknown |
---|
We have not received a statement from the vendor.
Notified: 2021-07-06 Updated: 2022-02-24 CVE-2022-23835 | Unknown |
---|
We have not received a statement from the vendor.
Notified: 2021-07-06 Updated: 2022-02-24 CVE-2022-23835 | Unknown |
---|
We have not received a statement from the vendor.
CVE IDs: | CVE-2022-23835 |
---|---|
Date Public: | 2022-02-24 Date First Published: |
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
8.1 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
56.5%