Bug 877572 (CVE-2012-5532)
| Summary: | CVE-2012-5532 hypervkvpd: Netlink source address validation allows denial of service | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Vincent Danen <vdanen> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | rdassen, security-response-team, thozza |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-05-14 17:02:35 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 872593, 872749, 953560 | ||
| Bug Blocks: | 877573 | ||
Upstream commit: https://git.kernel.org/?p=linux/kernel/git/gregkh/char-misc.git;a=commit;h=95a69adab9acfc3981c504737a2b6578e4d846ef 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/. 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. 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. 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). 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 |
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.