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Severity
Critical
Title
CS1000 FTP Session Limit Exhaustion
Description
The FTP service on the Nortel Communications Server 1000 (CS1K) on the VGMC and signaling nodes is used to provide firmware updates and basic configuration files to endpoints.
Details
Category
Denial of Service
Vendor
Nortel
Product
Communications Server 1000 4.50.x
Released
2008-04-01
updated
2008-04-01
Response
Attempting to address the issue
Recommendations
This issue requires a patch from Nortel to completely address. In the short term it is recommended that a VoIP aware IPS product, such as VoIPguard, with signatures to detect FTP session exhaustion be implemented to prevent it from being exploited or that a session limiting proxy be used. In addition, implementation of general best practice guidance such as controlling access to telephony networks via VLANs, access control lists, firewalls, network admission controls and/or other security devices will aid in limiting the exposure of this vulnerability.
Nortel customers with a valid support agreement may wish to speak with their support contact in order to obtain additional vendor details. Tracking Id
VSRNT-2008-001
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Each line represents an individual vulnerability or group of vulnerabilities. For example, "UCM Multiple Hardcoded Passwords" is presented here in a single line but was reported to Nortel as sixteen (16) individual vulnerabilities.
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