VAR-200703-0205

Vulnerability from variot - Updated: 2025-04-10 23:19

The HTTP server in Linksys SPA-921 VoIP Desktop Phone allows remote attackers to cause a denial of service (reboot) via (1) a long URL, or a long (2) username or (3) password during Basic Authentication. (1) Excessively long URL (2) Too long user name (3) Overly long passwords. Linksys SPA921 VoIP phones are prone to denial-of-service vulnerabilities because the devices fail to properly handle large user-supplied input values in HTTP traffic. Exploiting this issue allows remote attackers to crash and reboot affected devices, denying service to legitimate users.

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The vulnerability is caused due to errors within the embedded HTTP server when handling long strings. This can be exploited to reboot the phone by sending long HTTP requests to it.

The vulnerability has been reported in firmware version 1.0.0. Other versions may also be affected.

SOLUTION: Restrict use to within trusted networks only.

PROVIDED AND/OR DISCOVERED BY: Shawn Merdinger

About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.

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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.