Vulnerability CVE-2017-5669
Published: 2017-02-24

Description:
The do_shmat function in ipc/shm.c in the Linux kernel through 4.9.12 does not restrict the address calculated by a certain rounding operation, which allows local users to map page zero, and consequently bypass a protection mechanism that exists for the mmap system call, by making crafted shmget and shmat system calls in a privileged context.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Linux -> Linux kernel 

 References:
http://www.debian.org/security/2017/dsa-3804
http://www.securityfocus.com/bid/96754
http://www.securitytracker.com/id/1037918
https://bugzilla.kernel.org/show_bug.cgi?id=192931
https://github.com/torvalds/linux/commit/e1d35d4dc7f089e6c9c080d556feedf9c706f0c7
https://usn.ubuntu.com/3583-1/
https://usn.ubuntu.com/3583-2/
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