Vulnerability CVE-2016-9793
Published: 2016-12-28

Description:
The sock_setsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sk_sndbuf and sk_rcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAP_NET_ADMIN capability for a crafted setsockopt system call with the (1) SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option.

See advisories in our WLB2 database:
Topic
Author
Date
High
Linux Kernel 3.11 < 4.8 0 SO_SNDBUFFORCE SO_RCVBUFFORCE Local Privilege Escalation
Andrey Konovalov
12.05.2017

Type:

CWE-119

 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

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

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Linux -> Linux kernel 

 References:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14
http://www.openwall.com/lists/oss-security/2016/12/03/1
http://www.securityfocus.com/bid/94655
http://www.securitytracker.com/id/1037968
https://access.redhat.com/errata/RHSA-2017:0931
https://access.redhat.com/errata/RHSA-2017:0932
https://access.redhat.com/errata/RHSA-2017:0933
https://bugzilla.redhat.com/show_bug.cgi?id=1402013
https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
https://github.com/xairy/kernel-exploits/tree/master/CVE-2016-9793
https://source.android.com/security/bulletin/2017-03-01.html
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