FreeBSD PPP allows all network traffic to bypass the NAT gateway
| freebsd-ppp-bypass-gateway (5584) |  Medium Risk |
Description:
The FreeBSD PPP incorrectly allows traffic to pass through the NAT gateway. A remote attacker could exploit this to bypass the security policy on the system and perform attacks on the network.
Platforms Affected:
- FreeBSD, FreeBSD 3.5
- FreeBSD, FreeBSD 4.0
- FreeBSD, FreeBSD 4.1
- FreeBSD, FreeBSD 4.1.1
Remedy:
For FreeBSD 3.x:
Upgrade to the latest version of FreeBSD (3.5.1-STABLE dated after 2000-10-30 or later), as listed in FreeBSD, Inc. Security Advisory FreeBSD-SA-00:70. See References.
For FreeBSD 4.x:
Upgrade to the latest version of FreeBSD (4.1.1-STABLE dated after 2000-10-30, 4.2-RELEASE, or later), as listed in FreeBSD, Inc. Security Advisory FreeBSD-SA-00:70. See References.
Consequences:
Gain Access
References:
- FreeBSD Security Advisory FreeBSD-SA-00:70, ppp "deny_incoming" does not correctly deny incoming packets at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-00:70.ppp-nat.asc.
- BID-1974: FreeBSD ppp deny_incoming Vulnerability
- CVE-2000-1167: ppp utility in FreeBSD 4.1.1 and earlier does not properly restrict access as specified by the nat deny_incoming command, which allows remote attackers to connect to the target system.
- OSVDB ID: 1655: FreeBSD ppp deny_incoming
Reported:
Nov 14, 2000
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