Title: Squid Web Proxy Reverse Proxy Vulnerability
Severity: HIGH
Description:
Squid is a free client-side web proxy that retrieves cached web pages for quick browsers and a reduction in bandwidth consumption.
Squid servers, when configured as an "HTTP accelerator only", may allow remote attackers to use them as a port scanner. There is also a potential that they will grant proxied access to the malicious user.
It should be noted that this is not a default configuration.
Specifically, a function called 'clientAccessCheck' has a habit of incorrectly using ACLs(Access Control Lists). When configured in the above manner, Squid returns
'ACCESS_ALLOWED' for proxy requests. The correct response would be to generate an error message.
Affected Products:
- National Science Foundation Squid Web Proxy 2.3.0STABLE2
- National Science Foundation Squid Web Proxy 2.3.0STABLE3
- National Science Foundation Squid Web Proxy 2.3.0STABLE4
- RedHat Linux 6.2.0 alpha
- RedHat Linux 6.2.0 i386
- RedHat Linux 6.2.0 sparc
- RedHat Linux 7.0.0 alpha
- RedHat Linux 7.0.0 i386
- RedHat Linux 7.1.0 alpha
- RedHat Linux 7.1.0 i386
- RedHat Linux 7.1.0 ia64
References:
- National Science Foundation: Squid Cache Home Page
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