NVD Vulnerability Detail

CVE-2017-7495

Summary	fs/ext4/inode.c in the Linux kernel before 4.6.2, when ext4 data=ordered mode is used, mishandles a needs-flushing-before-commit list, which allows local users to obtain sensitive information from other users' files in opportunistic circumstances by waiting for a hardware reset, creating a new file, making write system calls, and reading this file.
Publication Date	May 16, 2017, 3:29 a.m.
Registration Date	Jan. 26, 2021, 1:28 p.m.
Last Update	Nov. 21, 2024, 12:32 p.m.

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:o:linux:linux_kernel::::::::			4.6.1

Related information, measures and tools

No	URL	タグ
1	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824	Issue Tracking Patch Third Party Advisory
2	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824	Issue Tracking Patch Third Party Advisory
3	http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.2	Release Notes Vendor Advisory
4	http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.2	Release Notes Vendor Advisory
5	http://www.openwall.com/lists/oss-security/2017/05/15/2	Mailing List Patch Third Party Advisory
6	http://www.openwall.com/lists/oss-security/2017/05/15/2	Mailing List Patch Third Party Advisory
7	http://www.securityfocus.com/bid/98491
8	http://www.securityfocus.com/bid/98491
9	https://bugzilla.redhat.com/show_bug.cgi?id=1450261	Issue Tracking Patch Third Party Advisory
10	https://bugzilla.redhat.com/show_bug.cgi?id=1450261	Issue Tracking Patch Third Party Advisory
11	https://github.com/torvalds/linux/commit/06bd3c36a733ac27962fea7d6f47168841376824	Issue Tracking Patch Third Party Advisory
12	https://github.com/torvalds/linux/commit/06bd3c36a733ac27962fea7d6f47168841376824	Issue Tracking Patch Third Party Advisory
13	https://source.android.com/security/bulletin/2017-09-01
14	https://source.android.com/security/bulletin/2017-09-01

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-200	情報漏えい	https://cwe.mitre.org/data/definitions/200.html

JVN Vulnerability Information

Linux Kernel の fs/ext4/inode.c における重要な情報を取得される脆弱性

Title	Linux Kernel の fs/ext4/inode.c における重要な情報を取得される脆弱性
Summary	Linux Kernel の fs/ext4/inode.c は、ext4 data=ordered モードが使用される際に needs-flushing-before-commit リストを誤って処理するため、他のユーザファイルから重要な情報を取得される脆弱性が存在します。
Possible impacts	ローカルユーザにより、ハードウェアのリセットを待たれ、新規ファイルを作成され、書き込みのシステムコールを実行してこのファイルを読まれることで、他のユーザファイルから重要な情報を取得され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	May 11, 2017, midnight
Registration Date	June 19, 2017, 5:30 p.m.
Last Update	June 19, 2017, 5:30 p.m.

Affected System

Linux

Linux Kernel 4.6.2 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-2017-7495	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7495
National Vulnerability Database (NVD)
2	CVE-2017-7495	https://nvd.nist.gov/vuln/detail/CVE-2017-7495
関連文書
3	CVE-2017-7495 kernel : information leak on ext4 when hardware reset.	http://www.openwall.com/lists/oss-security/2017/05/15/2

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-200	https://jvndb.jvn.jp/ja/cwe/CWE-200.html

ベンダー情報

No	Name	URL
ChangeLog
1	ChangeLog-4.6.2	https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.2
GitHub
2	ext4: fix data exposure after a crash	https://github.com/torvalds/linux/commit/06bd3c36a733ac27962fea7d6f47168841376824
Linux Kernel
3	Linux Kernel Archives	http://www.kernel.org
Linux kernel source tree
4	ext4: fix data exposure after a crash	https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=06bd3c36a733ac27962fea7d6f47168841376824
Red Hat Bugzilla
5	Bug 1450261	https://bugzilla.redhat.com/show_bug.cgi?id=1450261

Change Log

No	Changed Details	Date of change
0	[2017年06月19日] 掲載	Feb. 17, 2018, 10:37 a.m.