Bug 877572 - (CVE-2012-5532) CVE-2012-5532 hypervkvpd: Netlink source address validation allows denial of service
CVE-2012-5532 hypervkvpd: Netlink source address validation allows denial of ...
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20120606,reported=2...
: Security
Depends On: 872593 872749 953560
Blocks: 877573
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Reported: 2012-11-16 17:45 EST by Vincent Danen
Modified: 2013-05-14 13:02 EDT (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-05-14 13:02:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Vincent Danen 2012-11-16 17:45:23 EST
Florian Weimer of the Red Hat Product Security Team discovered that hypervkvpd
would exit when it processed a spoofed Netlink packet that had been sent from
an untrusted local user, in the following code:

        len = recvfrom(fd, kvp_recv_buffer, sizeof(kvp_recv_buffer), 0,
                addr_p, &addr_l);

        if (len < 0 || addr.nl_pid) {
            syslog(LOG_ERR, "recvfrom failed; pid:%u error:%d %s",
                    addr.nl_pid, errno, strerror(errno));
            close(fd);
            return -1;
        }


Acknowledgements:

This issue was discovered by Florian Weimer of the Red Hat Product Security
Team.
Comment 3 Vincent Danen 2012-11-27 13:18:57 EST
Statement:

The Red Hat Security Response Team has rated this issue as having low security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Comment 4 Vincent Danen 2012-11-27 13:57:39 EST
This was actually reported to oss-sec back in June:

http://seclists.org/oss-sec/2012/q2/476

And it was then assigned the name CVE-2012-2669.
Comment 5 Vincent Danen 2012-11-27 16:35:16 EST
As explained in:

http://www.openwall.com/lists/oss-security/2012/11/27/12

These are two different flaws.  CVE-2012-2669 is for "failing to check origin of netlink messages" and CVE-2012-5532 is for the "exiting upon receipt of spoofed netlink messages".

This bug is indeed for CVE-2012-5532.
Comment 7 Vincent Danen 2013-01-09 14:16:05 EST
Bug #893728 was filed for CVE-2012-2669, although it does not affect Red Hat Enterprise Linux 5 at all (so there is a statement to that effect with the appropriate references).
Comment 9 errata-xmlrpc 2013-05-09 14:15:04 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0807 https://rhn.redhat.com/errata/RHSA-2013-0807.html

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