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CVE Descriptions
Cisco PIX Firewall 515 and 520 with 5.1.4 OS running aaa authentication to a TACACS+ server allows remote attackers to cause a denial of service via a large number of authentication requests.
CVE Informations
Metrics
| Metrics | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 5 | AV:N/AC:L/Au:N/C:N/I:N/A:P | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 20734
Publication date : 2001-04-05 22h00 +00:00
Author : Claudiu Calomfirescu
EDB Verified : Yes
source: https://www.securityfocus.com/bid/2551/info
PIX is an enterprise firewall engineered and maintained by Cisco Systems. It is designed to provide robust features and multiple methods of access control and filtering.
A problem with the PIX could allow a denial of service. PIX firewalls using TACACS+ are vulnerable to a resource starvation attack which results in a denial of service. Upon receiving multiple requests for TACACS+ authentication from an unauthorized user, the firewalls resources can be exhausted. This causes the firewall to crash, requiring power cycling to resume regular service.
This makes it possible for a user from either the public or private side of the PIX to crash the firewall, and deny service to legitimate users.
All PIX Firewalls having configuration lines beginning with the following line are affected:
pixfirewall# aaa authentication
Any configurations not including aaa authentication are not affected.
while (true); do (wget http://external.system 2>/dev/null &); done
Products Mentioned
Configuraton 0
Cisco>>Pix_firewall_515 >> Version *
- Cisco>>Pix_firewall_515 >> Version - (Open CPE detail)
Cisco>>Pix_firewall_520 >> Version *
- Cisco>>Pix_firewall_520 >> Version - (Open CPE detail)
References
http://www.cisco.com/warp/public/707/pixfirewall-authen-flood-pub.shtml
Tags : vendor-advisory, x_refsource_CISCO
Tags : vendor-advisory, x_refsource_CISCO
