Date: Tue, 9 Jul 2013 12:03:40 -0700 From: Tyler Hicks <tyhicks@...onical.com> To: oss-security@...ts.openwall.com Cc: Chanam Park <chanam.park@...co.kr> Subject: Linux kernel libceph NULL function pointer dereference (CVE-2013-1059) Chanam Park discovered that a crafted auth_reply message could cause a NULL function pointer dereference in the libceph auth_none handler. A remote attacker could use this flaw to cause a denial of service. If a malicious Ceph monitor sends an auth_reply message with the value of -EAGAIN in the result field, ceph_build_auth_request() will call the ceph_auth_client_ops->build_request() function pointer without checking to see if the build_request() pointer is NULL. The auth_none handler does not initialize its build_request() pointer. See http://hkpco.kr/advisory/CVE-2013-1059.txt for more information. The fix can be found in the upstream ceph-client.git tree: https://git.kernel.org/cgit/linux/kernel/git/sage/ceph-client.git/commit/?id=2cb33cac622afde897aa02d3dcd9fbba8bae839e Tyler Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)
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