Date: Wed, 09 May 2012 17:31:25 +0200 From: Stefan Cornelius <scorneli@...hat.com> To: oss-security@...ts.openwall.com CC: thomas.swan@...il.com, bbraun@...ack.net Subject: CVE-2012-0862 assignment notification: xinetd enables unintentional services over tcpmux port Hi, Thomas Swan of FedEx reported a service disclosure flaw in xinetd. xinetd allows for services to be configured with the TCPMUX or TCPMUXPLUS service types, which makes those services available on port 1, as per RFC 1078 , if the tcpmux-server service is enabled. When the tcpmux-server service is enabled, xinetd would expose _all_ enabled services via the tcpmux port, instead of just the configured service(s). This could allow a remote attacker to bypass firewall restrictions and access services via the tcpmux port. In order for enabled services handled by xinetd to be exposed via the tcpmux port, the tcpmux-server service must be enabled (by default it is disabled). This has been assigned CVE-2012-0862. Thomas Swan also provided a patch , which has been reviewed by a former xinetd upstream maintainer and the Red Hat xinetd maintainer (upstream didn't respond to our contact attempts). -- References --  Red Hat bug: https://bugzilla.redhat.com/show_bug.cgi?id=790940  Proposed patch: https://bugzilla.redhat.com/attachment.cgi?id=583311 Thanks and kind regards, -- Stefan Cornelius / Red Hat Security Response Team
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