Linux kernel with DCC allows remote attacker to access arbitrary ports
| linux-dcc-port-access (8302) |  Medium Risk |
Description:
The netfilter connection tracking code in Linux kernel could allow a remote attacker to access arbitrary ports. A vulnerability regarding the lack of access restrictions could allow a remote attacker to access any listening port when a Direct Client Connection (DCC) chat is initiated.
Consequences:
Gain Access
Remedy:
For Red Hat Linux 7.1 and 7.2:
Upgrade to the latest kernel (2.4.9-31 or later), as listed in Red Hat Linux Errata Advisory RHSA-2002:028-13. See References.
For other distributions:
Contact your vendor for upgrade or patch information.
References:
- BugTraq Mailing List, Wed Feb 27 2002 - 08:02:50 CST: security advisory linux 2.4.x ip_conntrack_irc.
- Netfilter Web site: security/2002-02-25-irc-dcc-mask.body.
- BID-4188: Linux Kernel IRC DCC Connection Tracking Module Arbitrary Port Access Vulnerability
- CVE-2002-0060: IRC connection tracking helper module in the netfilter subsystem for Linux 2.4.18-pre9 and earlier does not properly set the mask for conntrack expectations for incoming DCC connections, which could allow remote attackers to bypass intended firewall restrictions.
- MDKSA-2002:041: Updated kernel packages fix multiple vulnerabilities
- RHSA-2002-028: Updated 2.4 kernel available
- US-CERT VU#230307: Linux kernel netfilter IRC DCC helper module creates overly permissive firewall rules
Platforms Affected:
- Linux Kernel 2.4.18 pre1
- Linux Kernel 2.4.18 pre2
- Linux Kernel 2.4.18 pre3
- Linux Kernel 2.4.18 pre4
- Linux Kernel 2.4.18 pre5
- Linux Kernel 2.4.18 pre6
- Linux Kernel 2.4.18 pre7
- Linux Kernel 2.4.18 pre9
- Linux Kernel 2.4.18 pre8
- RedHat Linux 7
- RedHat Linux 7.1
- RedHat Linux 7.2
- RedHat Linux 7.3
Reported:
Feb 27, 2002
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