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JVN脆弱性詳細

Linux Kernel の net/core/sock.c の sock_setsockopt 関数におけるサービス運用妨害 (DoS) の脆弱性

Title	Linux Kernel の net/core/sock.c の sock_setsockopt 関数におけるサービス運用妨害 (DoS) の脆弱性
Summary	Linux Kernel の net/core/sock.c の sock_setsockopt 関数は、sk_sndbuf および sk_rcvbuf の負の値を誤って処理するため、サービス運用妨害 (メモリ破損およびシステムクラッシュ) 状態にされるなど、不特定の影響を受ける脆弱性が存在します。
Possible impacts	ローカルユーザにより、(1) SO_SNDBUFFORCE または (2) SO_RCVBUFFORCE オプションを伴う巧妙に細工された setsockopt システムコールの CAP_NET_ADMIN ケーパビリティを利用されることで、サービス運用妨害 (メモリ破損およびシステムクラッシュ) 状態にされるなど、不特定の影響を受ける可能性があります。
Solution	ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date	Dec. 10, 2016, midnight
Registration Date	Jan. 11, 2017, 3:44 p.m.
Last Update	Jan. 11, 2017, 3:44 p.m.

CVSS3.0 : 重要
Score	7.8
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS2.0 : 危険
Score	7.2
Vector	AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected System

Linux

Linux Kernel 4.8.14 未満

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2016-9793	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-9793
National Vulnerability Database (NVD)
2	CVE-2016-9793	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9793

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-119	https://jvndb.jvn.jp/ja/cwe/CWE-119.html

ベンダー情報

No	Name	URL
ChangeLog
1	ChangeLog-4.8.14	https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14
GitHub
2	net: avoid signed overflows for SO_{SND\|RCV}BUFFORCE	https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
Linux Kernel
3	Linux Kernel Archives	http://www.kernel.org
Linux kernel source tree
4	net: avoid signed overflows for SO_{SND\|RCV}BUFFORCE	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290
Red Hat Bugzilla
5	Bug 1402013	https://bugzilla.redhat.com/show_bug.cgi?id=1402013

Change Log

No	Changed Details	Date of change
0	[2017年01月11日] 掲載	Feb. 17, 2018, 10:37 a.m.

NVD Vulnerability Information

CVE-2016-9793

Summary	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.
Publication Date	Dec. 28, 2016, 4:59 p.m.
Registration Date	Jan. 26, 2021, 2:20 p.m.
Last Update	Nov. 21, 2024, 12:01 p.m.

Affected software configurations

Configuration1	or higher	or less	more than	less than
cpe:2.3:o:linux:linux_kernel::::::::	3.13			3.16.40
cpe:2.3:o:linux:linux_kernel::::::::	3.17			3.18.52
cpe:2.3:o:linux:linux_kernel::::::::	4.5			4.8.14
cpe:2.3:o:linux:linux_kernel::::::::	4.2			4.4.38
cpe:2.3:o:linux:linux_kernel::::::::	3.5			3.12.69
cpe:2.3:o:linux:linux_kernel::::::::	3.19			4.1.50

Related information, measures and tools

No	URL	タグ
1	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290	Patch Vendor Advisory
2	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290	Patch Vendor Advisory
3	http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14	Release Notes Vendor Advisory
4	http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14	Release Notes Vendor Advisory
5	http://www.openwall.com/lists/oss-security/2016/12/03/1	Mailing List Patch Third Party Advisory
6	http://www.openwall.com/lists/oss-security/2016/12/03/1	Mailing List Patch Third Party Advisory
7	http://www.securityfocus.com/bid/94655	Third Party Advisory VDB Entry
8	http://www.securityfocus.com/bid/94655	Third Party Advisory VDB Entry
9	http://www.securitytracker.com/id/1037968	Third Party Advisory VDB Entry
10	http://www.securitytracker.com/id/1037968	Third Party Advisory VDB Entry
11	https://access.redhat.com/errata/RHSA-2017:0931	Third Party Advisory
12	https://access.redhat.com/errata/RHSA-2017:0931	Third Party Advisory
13	https://access.redhat.com/errata/RHSA-2017:0932	Third Party Advisory
14	https://access.redhat.com/errata/RHSA-2017:0932	Third Party Advisory
15	https://access.redhat.com/errata/RHSA-2017:0933	Third Party Advisory
16	https://access.redhat.com/errata/RHSA-2017:0933	Third Party Advisory
17	https://bugzilla.redhat.com/show_bug.cgi?id=1402013	Issue Tracking Third Party Advisory
18	https://bugzilla.redhat.com/show_bug.cgi?id=1402013	Issue Tracking Third Party Advisory
19	https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290	Patch Vendor Advisory
20	https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290	Patch Vendor Advisory
21	https://github.com/xairy/kernel-exploits/tree/master/CVE-2016-9793	Third Party Advisory
22	https://github.com/xairy/kernel-exploits/tree/master/CVE-2016-9793	Third Party Advisory
23	https://source.android.com/security/bulletin/2017-03-01.html	Third Party Advisory
24	https://source.android.com/security/bulletin/2017-03-01.html	Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-119	バッファエラー	https://cwe.mitre.org/data/definitions/118.html