Title: FreeBSD tcp_wrappers PARANOID Checking Bypass Vulnerability
Severity: HIGH
Description:
A problem exists in tcp_wrappers that may cause some checks to fail when the 'PARANOID' ACL option is enabled in the configuration file.
The 'PARANOID' ACL option is used to cause tcp_wrappers to drop requests from any host that has a name that does not match it's address. The problem is the result of a flawed check for a numeric result during reverse DNS lookup.
If an attacker is able to influence the results of reverse DNS lookups, they may be able to bypass these restrictions by impersonating a trusted host. This may allow an attacker to bypass the host access control rules on a vulnerable system, possibly leading to further attacks against the host.
Affected Products:
- FreeBSD FreeBSD 4.1.1 -RELEASE
- FreeBSD FreeBSD 4.2.0 -RELEASE
- FreeBSD FreeBSD 4.3.0 -RELEASE
References:
- FreeBSD: FreeBSD Security Information
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