Date: Fri, 6 May 2016 11:40:21 -0400 (EDT) From: cve-assign@...re.org To: carnil@...ian.org Cc: cve-assign@...re.org, oss-security@...ts.openwall.com Subject: Re: CVE Requests: Linux: BPF flaws (one use-after-free / local root privilege escalation) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 > A use-after-free flaw via double-fdput in bpf was recently fixed in > Linux. Details: > > https://bugs.chromium.org/p/project-zero/issues/detail?id=808 > > Fixed via: > https://git.kernel.org/linus/8358b02bf67d3a5d8a825070e1aa73f25fb2e4c7 > > And as well reported/forwarded in Debian: > https://bugs.debian.org/823603 Use CVE-2016-4557. (Additional notes about this: in 808, the first paragraph describes intentional behavior. The kernel/bpf/verifier.c attack surface for unprivileged users is also relevant to one or more previous CVEs such as CVE-2016-2383. Also, the paragraphs after "There are two problems with this approach" describe kernel behaviors that make CVE-2016-4557 exploitation more reliable. We do not currently feel that these behaviors should have CVE IDs. For example, the paragraphs mention "abusing the writev() syscall and FUSE" and "has to wait for the attacker-owned FUSE filesystem to resolve the pagefault, allowing the attacker to suspend code execution in the kernel at that point arbitrarily.") > bpf: fix refcnt overflow: > https://git.kernel.org/linus/92117d8443bc5afacc8d5ba82e541946310f106e Use CVE-2016-4558. (The "program refcnt" and "map refcnt" problems are not precisely analogous but we feel that the one ID, CVE-2016-4558, is sufficient.) > bpf: fix check_map_func_compatibility logic > https://git.kernel.org/linus/6aff67c85c9e5a4bc99e5211c1bac547936626ca > > Not sure though if the later one has a security impact. We have not yet assigned a CVE ID to 6aff67c85c9e5a4bc99e5211c1bac547936626ca in case someone else wants to provide additional information. - -- CVE Assignment Team M/S M300, 202 Burlington Road, Bedford, MA 01730 USA [ A PGP key is available for encrypted communications at http://cve.mitre.org/cve/request_id.html ] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCAAGBQJXLLoiAAoJEHb/MwWLVhi2dnQP/2P3MLVWWfYTlmj6mOLImmtM Ag8ChZX2PpdGd69SxwryOKpEGnyfu30/teUp3AiZW8f4M9eAftFSl0dICJip3wS5 9zhi4KhQYDOlTi6xujXYSG7KUQVckyLkCurxwhsW8rGs9xUNKrMkrivcCu94SANk a0tg2FIoTcXyVTPSs6V4LwhyDAChLDFUCCuqNwFupvWRqshdkI6cjE4rJ1al8iP4 ujfWtJlqFnofvL6vEE3ZEAe7Y8N2ZN22z2E3dM+9CKyEdZ+Gij/8YKBThYKjC2Ku bZ5jEJjvlGZyXGg+k40XFT5r8k+1LUE2uLk0eNCN/3Sc/LgeDMKmSqfiAX+LsGS1 s+8vDweQ72Q1OoxoiChvoK5d0e4RT/5UtinjA3h/1yABBFJ/4StwTjZkkSHr8o7a JD60QEG8PEdzz8hEFh6FyoaLXcz52PKe54cI2kbqiKfXytJMOmrNSf/v/hBMVjFV CzT1ZYmIQUxhllqNzxmangWnijCq0eNCUCEHvgc6qNwPyQTsB5uj0cqaDaKkmH2z 5Wyt2sFvVsIi3vFZr8y7mjM243V7hH5xXurhUOFIzhzF5YvTZ/eaq8ibpolBgyrB CleVL3ok8uy0ikCblzVnHgEqsYl3GX4CMF4PMeayIO9seo5iPuh5eGutgdwuLDlV osmgYu9VbVVb8mMPATPw =V36N -----END PGP SIGNATURE-----
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