NVD Vulnerability Detail

CVE-2014-5045

Summary	The mountpoint_last function in fs/namei.c in the Linux kernel before 3.15.8 does not properly maintain a certain reference count during attempts to use the umount system call in conjunction with a symlink, which allows local users to cause a denial of service (memory consumption or use-after-free) or possibly have unspecified other impact via the umount program.
Publication Date	Aug. 1, 2014, 8:13 p.m.
Registration Date	Jan. 26, 2021, 3:13 p.m.
Last Update	Nov. 21, 2024, 11:11 a.m.

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:o:linux:linux_kernel::::::::					3.15.8

Configuration2	or higher	or less	more than	less than
cpe:2.3:o:redhat:enterprise_linux_server_aus:6.5:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:6.5:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:6.5:::::::*

Related information, measures and tools

No	URL	タグ
1	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=295dc39d941dc2ae53d5c170365af4c9d5c16212
2	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=295dc39d941dc2ae53d5c170365af4c9d5c16212
3	http://rhn.redhat.com/errata/RHSA-2015-0062.html	Third Party Advisory
4	http://rhn.redhat.com/errata/RHSA-2015-0062.html	Third Party Advisory
5	http://secunia.com/advisories/60353	Third Party Advisory
6	http://secunia.com/advisories/60353	Third Party Advisory
7	http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.8	Patch Third Party Advisory Vendor Advisory
8	http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.8	Patch Third Party Advisory Vendor Advisory
9	http://www.openwall.com/lists/oss-security/2014/07/24/2	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2014/07/24/2	Mailing List Third Party Advisory
11	http://www.securityfocus.com/bid/68862	Third Party Advisory VDB Entry
12	http://www.securityfocus.com/bid/68862	Third Party Advisory VDB Entry
13	https://bugzilla.redhat.com/show_bug.cgi?id=1122472	Issue Tracking Third Party Advisory
14	https://bugzilla.redhat.com/show_bug.cgi?id=1122472	Issue Tracking Third Party Advisory
15	https://github.com/torvalds/linux/commit/295dc39d941dc2ae53d5c170365af4c9d5c16212	Exploit Patch Third Party Advisory
16	https://github.com/torvalds/linux/commit/295dc39d941dc2ae53d5c170365af4c9d5c16212	Exploit Patch Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-59	リンク解釈の問題	https://cwe.mitre.org/data/definitions/59.html

JVN Vulnerability Information

Linux Kernel の fs/namei.c 内の mountpoint_last 関数におけるサービス運用妨害 (DoS) の脆弱性

Title	Linux Kernel の fs/namei.c 内の mountpoint_last 関数におけるサービス運用妨害 (DoS) の脆弱性
Summary	Linux Kernel の fs/namei.c 内の mountpoint_last 関数は、シンボリックリンクと関連する umount システムコールの使用を試みる間、特定の参照カウントを適切に保持できないため、サービス運用妨害 (メモリ消費または use-after-free) 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、umount プログラムを介して、サービス運用妨害 (メモリ消費または use-after-free) 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	July 31, 2014, midnight
Registration Date	Aug. 4, 2014, 4:07 p.m.
Last Update	June 8, 2015, 5:09 p.m.

Affected System

Linux

Linux Kernel 3.15.8 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-2014-5045	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5045
National Vulnerability Database (NVD)
2	CVE-2014-5045	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-5045

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-59	https://jvndb.jvn.jp/ja/cwe/CWE-59.html

ベンダー情報

No	Name	URL
ChangeLog
1	ChangeLog-3.15.8	https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.8
GitHub
2	fs: umount on symlink leaks mnt count	https://github.com/torvalds/linux/commit/295dc39d941dc2ae53d5c170365af4c9d5c16212
Linux Kernel
3	Linux Kernel Archives	http://www.kernel.org
Linux kernel source tree
4	fs: umount on symlink leaks mnt count	http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=295dc39d941dc2ae53d5c170365af4c9d5c16212
Red Hat Bugzilla
5	Bug 1122472	https://bugzilla.redhat.com/show_bug.cgi?id=1122472
Red Hat Security Advisory
6	RHSA-2015:0062	https://rhn.redhat.com/errata/RHSA-2015-0062.html

Change Log

No	Changed Details	Date of change
0	[2014年08月04日] 掲載 [2015年06月08日] ベンダ情報：レッドハット (RHSA-2015:0062) を追加	Feb. 17, 2018, 10:37 a.m.