VAR-200704-0461
Vulnerability from variot - Updated: 2025-04-10 23:11The Linksys SPA941 VoIP Phone allows remote attackers to cause a denial of service (device reboot) via a 0377 (0xff) character in the From header, and possibly certain other locations, in a SIP INVITE request. Linksys SPA941 phones are prone to a remote denial-of-service vulnerability. Linksys SPA941 is a 2-wire or 4-wire IP phone. The Linksys SPA941 phone does not correctly handle the \377 character in the SIP message. If the attacker contains the above character in any part of the FROM header of the sent message, it may cause the phone to restart; if the character is in other positions, it may modify the phone's Generate the content of the reply message.
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The vulnerability is caused due to an error in the processing of SIP messages. This can be exploited to reboot the phone by sending specially crafted SIP messages containing "\337" characters.
The vulnerability is reported in software version 5.1.5. Other versions may also be affected.
SOLUTION: Use only in a trusted network environment.
PROVIDED AND/OR DISCOVERED BY: Radu State
ORIGINAL ADVISORY: http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053959.html
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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"data": "The Linksys SPA941 VoIP Phone allows remote attackers to cause a denial of service (device reboot) via a 0377 (0xff) character in the From header, and possibly certain other locations, in a SIP INVITE request. Linksys SPA941 phones are prone to a remote denial-of-service vulnerability. Linksys SPA941 is a 2-wire or 4-wire IP phone. The Linksys SPA941 phone does not correctly handle the \\377 character in the SIP message. If the attacker contains the above character in any part of the FROM header of the sent message, it may cause the phone to restart; if the character is in other positions, it may modify the phone\u0027s Generate the content of the reply message. \n\n----------------------------------------------------------------------\n\nTry a new way to discover vulnerabilities that ALREADY EXIST in your\nIT infrastructure. \n\nJoin the FREE BETA test of the Network Software Inspector (NSI)!\nhttp://secunia.com/network_software_inspector/\n\nThe NSI enables you to INSPECT, DISCOVER, and DOCUMENT\nvulnerabilities in more than 4,000 different Windows applications. \n\nThe vulnerability is caused due to an error in the processing of SIP\nmessages. This can be exploited to reboot the phone by sending\nspecially crafted SIP messages containing \"\\337\" characters. \n\nThe vulnerability is reported in software version 5.1.5. Other\nversions may also be affected. \n\nSOLUTION:\nUse only in a trusted network environment. \n\nPROVIDED AND/OR DISCOVERED BY:\nRadu State\n\nORIGINAL ADVISORY:\nhttp://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053959.html\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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