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It has been reported that the ftpd server, included in the Embedded Real Time Operating System (ERTOS) of 3Com Superstack 3 NBX IP phones, contains a denial of service vulnerability. This issue can be triggered by sending a CEL paramater of excessive length, effectively causing the ftpd server and various VoIP services to no longer respond.

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.

References:

  • Denial Of Service Attack /FTP Server Crash Fixed For CS 1000Denial Of Service Attack /FTP Server Crash Fixed For CS 1000 (Nortel Networks)
  • [VU#317417] Denial of Service condition in vxworks ftpd/3com nbx[VU#317417] Denial of Service condition in vxworks ftpd/3com nbx ("Michael S. Scheidell" <This email address is being protected from spambots. You need JavaScript enabled to view it.>)
  • 3com NBX IP Phone Call manager Denial of Service - Update3com NBX IP Phone Call manager Denial of Service - Update (Michael Scheidell <This email address is being protected from spambots. You need JavaScript enabled to view it.>)