CyberSecBulletin
CVE-2022-20774NVD status: Modified

Cisco IP Phone 7800 Series with Multiplatform…: Cross-Site Request Forgery

Published Updated By the CyberSecBulletin desk

CVE-2022-20774 is a high-severity cross-site request forgery vulnerability in Cisco IP Phone 7800 Series with Multiplatform Firmware from Cisco, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. There is no confirmed exploitation so far. EPSS estimates a 0.4% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update IP Phone 6871 Firmware to 11.3.5 or a later version.
  2. Update IP Phone 6861 Firmware to 11.3.5 or a later version.
  3. Update IP Phone 6851 Firmware to 11.3.5 or a later version.
  4. Read the advisory on tools.cisco.com for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
  6. Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.

Affected products and versions

VendorProductAffected versionsFixed in
CiscoCisco IP Phone 7800 Series with Multiplatform FirmwareNot specified in the recordNot stated
CiscoIP Phone 6871 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 6861 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 6851 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 6841 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 6825 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 7861 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 7841 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 7832 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 7821 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 7811 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8865 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8861 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8851 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8845 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8841 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8832 Firmwarebefore 11.3.511.3.5
CiscoIP Phone 8811 Firmwarebefore 11.3.511.3.5

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
RequiredA user must take an action such as opening a file or link.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.16.8MediumCNA (cisco.com)
CVSS 3.18.1HighNVD
CVSS 2.04.9MediumNVD

Official description

A vulnerability in the web-based management interface of Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware could allow an unauthenticated, remote attacker to conduct a cross-site request forgery (CSRF) attack against a user of the web-based interface of an affected system. This vulnerability is due to insufficient CSRF protections for the web-based management interface of an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the interface to follow a crafted link. A successful exploit could allow the attacker to perform configuration changes on the affected device, resulting in a denial of service (DoS) condition.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Cross-Site Request Forgery

The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.

How developers prevent this class of flaw

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, use anti-CSRF packages such as the OWASP CSRFGuard. Another example is the ESAPI Session Management control, which includes a component for CSRF.
  • Ensure that the application is free of cross-site scripting issues (CWE-79), because most CSRF defenses can be bypassed using attacker-controlled script.
  • Generate a unique nonce for each form, place the nonce into the form, and verify the nonce upon receipt of the form. Be sure that the nonce is not predictable (CWE-330).

More Cross-Site Request Forgery vulnerabilities (CWE-352)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Cross-Site Request Forgery vulnerabilities

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