var-200912-0285
Vulnerability from variot
The (1) CHAP and (2) MS-CHAP-V2 authentication capabilities in the PPP Access Concentrator (PPPAC) function in Internet Initiative Japan SEIL/B1 firmware 1.00 through 2.52 use the same challenge for each authentication attempt, which allows remote attackers to bypass authentication via a replay attack. As a result, the third party may gain access to the network. According the developer, when L2TP/IPsec is being used, the authentication challenges are protected by the encryption provided by IPsec, and therefore the probability of being affected by this issue are reduced. SEIL/B1 is prone to an authentication-bypass vulnerability affecting CHAP and MS-CHAP-V2 authentication. Versions prior to SEIL/B1 2.60 are vulnerable. ----------------------------------------------------------------------
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TITLE: SEIL Routers PPP Access Concentrator Replay Vulnerability
SECUNIA ADVISORY ID: SA37628
VERIFY ADVISORY: http://secunia.com/advisories/37628/
DESCRIPTION: A vulnerability has been reported in the SEIL B1 router, which can be exploited by malicious people to bypass certain security restrictions.
SOLUTION: Update to version 2.60.
PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.
ORIGINAL ADVISORY: SEIL: http://www.seil.jp/seilseries/security/2009/a00697.php
JVN: http://jvn.jp/en/jp/JVN49602378/index.html http://jvndb.jvn.jp/en/contents/2009/JVNDB-2009-000079.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.
Subscribe: http://secunia.com/advisories/secunia_security_advisories/
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Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor.
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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