Title: 3Com SuperStack 3 NBX FTPD Denial of Service Vulnerability
Severity: HIGH
Description:
A vulnerability has been discovered in 3Com SuperStack 3 NBX IP telephones. Reportedly the ftpd server included in the Embedded Real Time Operating System (ERTOS) contains a vulnerability that may cause a denial of service. This issue occurs when a malicious CEL request is made to the ftpd server, with a parameter containing 2048 or more bytes of data.
Exploiting this issue may cause the vulnerable ftpd server to crash as well as various VoIP features to no longer respond. These features include the web based administrative console and call manager. It may also prevent calls in progress from being ended, which may result in excessive long distance charges.
A hard reset of the device is required to restore functionality, which under abrupt circumstances may cause data loss or corruption.
It should be noted that this issue may be similar to the vulnerability described in BID 679.
Although unconfirmed, it should also be noted that due to the nature of this vulnerability under some circumstances it may be exploited to execute arbitrary code.
Affected Products:
- 3Com 3Com SuperStack 3 NBX 4.0.17
- 3Com 3Com SuperStack 3 NBX 4.1.21
- 3Com 3Com SuperStack 3 NBX 4.1.4
- Nortel Networks CS 1000 0.0.0
References:
- Nortel Networks: Denial Of Service Attack /FTP Server Crash Fixed For CS 1000
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