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Cisco VPN 3000 Concentrator HTTP Packet Denial of Service
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Secunia Advisory:
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SA18629
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Release Date:
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2006-01-27
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Last Update:
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2006-04-27
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Cisco VPN 3000 Concentrator
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| | CVE reference: | CVE-2006-0483 (Secunia mirror)
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Description:
Two vulnerabilities have been reported in Cisco VPN 3000 Concentrator, which can be exploited by malicious people to cause a DoS (Denial of Service).
1) An error exists when processing HTTP packets and can be exploited to cause the network device to halt and drop established user connections by sending about 40 specially crafted HTTP packet to the concentrator.
Successful exploitation requires that the HTTP service is enabled (default setting) and may disable the network device requiring a reboot to regain functionality.
According to the vendor, the vulnerability affects software versions 4.7.0 through 4.7.2.A (including version 4.7REL). The discoverer of the vulnerability also reports the vulnerability in version 4.7.2.B. Software versions prior to 4.7.x are not affected.
2) An error exists within the management of TCP connections to port 80. This can be exploited to cause the device to stall and drop user connections by consuming large amount of memory and other resources via multiple open connections.
The vulnerability has been reported in software versions 4.1.x and 4.7.x. Software versions prior to 4.1.x are not affected.
Solution:
Update to software version 4.1.7.L or 4.7.2.F.
http://www.cisco.com/pcgi-bin/tablebuild.pl/vpn3000-3des
The vendor reports that the vulnerability #1 has been fixed in software version 4.7.2.B. However, this is not correct according to the discoverer of the vulnerability.
Provided and/or discovered by:
1) Eldon Sprickerhoff, eSentire Inc.
2) Reported by vendor.
Changelog:
2006-01-30: Updated description and credits. Updated "Solution" section.
2006-01-31: Added link to researcher's advisory.
2006-02-02: Updated description.
2006-02-03: Added CVE reference.
2006-04-27: Updated "Solution Status", "Description", "Solution" and credit sections.
Original Advisory:
Cisco:
http://www.cisco.com/warp/public/707/cisco-sa-20060126-vpn.shtml
eSentire:
http://www.esentire.com/news/vuln-cisco-vpn.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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10. Cisco VPN 3000 Concentrator Multiple Vulnerabilities
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