NetScreen-25 remote SSH request denial of service
| netscreen-ssh-dos (10528) |  Low Risk |
Description:
NetScreen-25 and possibly other NetScreen security devices with the SSH (Secure Shell) management port enabled, are vulnerable to a denial of service attack. A remote attacker could send a malformed request to the SSH management port on the NetScreen device to cause the device to crash. This vulnerability could also be triggered using the "SSH CRC32" remote exploit.For more information on the "SSH CRC32" vulnerability, refer to Internet Security Systems Security Alert, October 30, 2001. See References.
Platforms Affected:
- Juniper, NetScreen ScreenOS 4.0.0
- Juniper, NetScreen ScreenOS 4.0.0r1
- Juniper, NetScreen ScreenOS 4.0.0r2
- Juniper, NetScreen ScreenOS 4.0.0r3
- Juniper, NetScreen ScreenOS 4.0.0r4
- Juniper, NetScreen ScreenOS 4.0.0r5
- Juniper, NetScreen ScreenOS 4.0.0r6
Remedy:
Upgrade to the latest version of ScreenOS (4.0.0r6 or later), available from the NetScreen Web site. See References.
As a workaround, disable the SSH remote management port.
Consequences:
Denial of Service
References:
- BugTraq Mailing List, Fri Nov 01 2002 - 12:30:39 CST , Netscreen SSH1 CRC32 Compensation Denial of service at http://archives.neohapsis.com/archives/bugtraq/2002-10/0443.html.
- BugTraq Mailing List, Fri Nov 01 2002 - 12:58:45 CST , (Correction) Netscreen SSH1 CRC32 Compensation Denial of service at http://archives.neohapsis.com/archives/bugtraq/2002-10/0446.html.
- Internet Security Systems Security Alert, October 30, 2001, Widespread Exploitation of SSH CRC32 Compensation Attack at http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=20300.
- NetScreen Web site, NetScreen - Software Updates at http://www.netscreen.com/support/updates.html.
- CVE-2002-1547: Netscreen running ScreenOS 4.0.0r6 and earlier allows remote attackers to cause a denial of service via a malformed SSH packet to the Secure Command Shell (SCS) management interface, as demonstrated via certain CRC32 exploits, a different vulnerability than CVE-2001-0144.
- OSVDB ID: 4376: NetScreen ScreenOS SSH1 Remote Request DoS
- US-CERT VU#930161: NetScreen Secure Command Shell (SCS) denial-of-service vulnerability
Reported:
Nov 01, 2002
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