NVD Vulnerability Detail

CVE-2018-20685

Summary	In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.
Publication Date	Jan. 11, 2019, 6:29 a.m.
Registration Date	March 1, 2021, 7:18 p.m.
Last Update	Nov. 21, 2024, 1:01 p.m.

CVSS3.1 : MEDIUM
スコア	5.3
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	高
攻撃に必要な特権レベル(PR)	不要
利用者の関与(UI)	要
影響の想定範囲(S)	変更なし
機密性への影響(C)	なし
完全性への影響(I)	高
可用性への影響(A)	なし

CVSS2.0 : LOW
Score	2.6
Vector	AV:N/AC:H/Au:N/C:N/I:P/A:N
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	高
攻撃前の認証要否(Au)	不要
機密性への影響(C)	なし
完全性への影響(I)	低
可用性への影響(A)	なし
Get all privileges.	いいえ
Get user privileges	いいえ
Get other privileges	いいえ
User operation required	はい

Affected software configurations

Configuration1	or higher	or less	more than	less than
cpe:2.3:a:openbsd:openssh::::::::		7.9
cpe:2.3:a:winscp:winscp::::::::		5.13

Configuration2	or higher	or less	more than	less than
cpe:2.3:a:netapp:cloud_backup:-:::::::*
cpe:2.3:a:netapp:element_software:-:::::::*
cpe:2.3:a:netapp:storage_automation_store:-:::::::*
cpe:2.3:a:netapp:ontap_select_deploy:-:::::::*
cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:::::::*

Configuration3	or higher	or less	more than	less than
cpe:2.3:o:debian:debian_linux:8.0:::::::*
cpe:2.3:o:debian:debian_linux:9.0:::::::*

Configuration4	or higher	or less	more than	less than
cpe:2.3:o:canonical:ubuntu_linux:16.04::::lts:::
cpe:2.3:o:canonical:ubuntu_linux:14.04::::lts:::
cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
cpe:2.3:o:canonical:ubuntu_linux:18.10:::::::*

Configuration5	or higher	or less	more than	less than
cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:::::::*

Configuration6		or higher	or less	more than	less than
cpe:2.3:o:oracle:solaris:10:::::::*

Configuration7		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-1_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m10-1:-:::::::*

Configuration8		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-4_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m10-4:-:::::::*

Configuration9		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-4s_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m10-4s:-:::::::*

Configuration10		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-1_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m12-1:-:::::::*

Configuration11		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-2_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m12-2:-:::::::*

Configuration12		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-2s_firmware::::::::					xcp2361
execution environment
1	cpe:2.3:h:fujitsu:m12-2s:-:::::::*

Configuration13		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-1_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m10-1:-:::::::*

Configuration14		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-4_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m10-4:-:::::::*

Configuration15		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-4s_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m10-4s:-:::::::*

Configuration16		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m10-4s_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m10-4s:-:::::::*

Configuration17		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-1_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m12-1:-:::::::*

Configuration18		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-2_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m12-2:-:::::::*

Configuration19		or higher	or less	more than	less than
cpe:2.3:o:fujitsu:m12-2s_firmware::::::::					xcp3070
execution environment
1	cpe:2.3:h:fujitsu:m12-2s:-:::::::*

Configuration20		or higher	or less	more than	less than
cpe:2.3:o:siemens:scalance_x204rna_firmware::::::::					3.2.7
execution environment
1	cpe:2.3:h:siemens:scalance_x204rna:-:::::::*

Configuration21		or higher	or less	more than	less than
cpe:2.3:o:siemens:scalance_x204rna_eec_firmware::::::::					3.2.7
execution environment
1	cpe:2.3:h:siemens:scalance_x204rna_eec:-:::::::*

Related information, measures and tools

No	URL	タグ
1	http://www.securityfocus.com/bid/106531	Broken Link
2	http://www.securityfocus.com/bid/106531	Broken Link
3	https://access.redhat.com/errata/RHSA-2019:3702	Third Party Advisory
4	https://access.redhat.com/errata/RHSA-2019:3702	Third Party Advisory
5	https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf	Patch Third Party Advisory
6	https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf	Patch Third Party Advisory
7	https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h	Patch
8	https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h	Patch
9	https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2	Patch
10	https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2	Patch
11	https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html	Mailing List Third Party Advisory
12	https://lists.debian.org/debian-lts-announce/2019/03/msg00030.html	Mailing List Third Party Advisory
13	https://security.gentoo.org/glsa/201903-16	Third Party Advisory
14	https://security.gentoo.org/glsa/201903-16	Third Party Advisory
15	https://security.gentoo.org/glsa/202007-53	Third Party Advisory
16	https://security.gentoo.org/glsa/202007-53	Third Party Advisory
17	https://security.netapp.com/advisory/ntap-20190215-0001/	Third Party Advisory
18	https://security.netapp.com/advisory/ntap-20190215-0001/	Third Party Advisory
19	https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt	Patch Third Party Advisory
20	https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt	Patch Third Party Advisory
21	https://usn.ubuntu.com/3885-1/	Third Party Advisory
22	https://usn.ubuntu.com/3885-1/	Third Party Advisory
23	https://www.debian.org/security/2019/dsa-4387	Third Party Advisory
24	https://www.debian.org/security/2019/dsa-4387	Third Party Advisory
25	https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html	Patch Third Party Advisory
26	https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html	Patch Third Party Advisory
27	https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html	Patch Third Party Advisory
28	https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html	Patch Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-863	不正な認証	https://cwe.mitre.org/data/definitions/863.html

JVN Vulnerability Information

OpenSSH におけるアクセス制御に関する脆弱性

Title	OpenSSH におけるアクセス制御に関する脆弱性
Summary	OpenSSH には、アクセス制御に関する脆弱性が存在します。
Possible impacts	情報を改ざん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	Nov. 16, 2018, midnight
Registration Date	March 7, 2019, 2:36 p.m.
Last Update	March 7, 2019, 2:36 p.m.

Affected System

OpenBSD

OpenSSH 7.9

Debian

Debian GNU/Linux

Canonical

Ubuntu

NetApp

Element Software

NetApp Cloud Backup

ONTAP Select Deploy administration utility

SteelStore Cloud Integrated Storage

Storage Automation Store

WinSCP

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-2018-20685	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20685
2	CVE-2018-20685	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20685
National Vulnerability Database (NVD)
3	CVE-2018-20685	https://nvd.nist.gov/vuln/detail/CVE-2018-20685
4	CVE-2018-20685	https://nvd.nist.gov/vuln/detail/CVE-2018-20685

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-284	https://cwe.mitre.org/data/definitions/284.html
2	CWE-284	https://cwe.mitre.org/data/definitions/284.html

ベンダー情報

No	Name	URL
Debian Security Advisory
1	DSA-4387	https://www.debian.org/security/2019/dsa-4387
2	DSA-4387	https://www.debian.org/security/2019/dsa-4387
GitHub
3	upstream: disallow empty incoming filename or ones that refer to the current directory	https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2
4	upstream: disallow empty incoming filename or ones that refer to the current directory	https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2
NetApp Advisory
5	NTAP-20190215-0001	https://security.netapp.com/advisory/ntap-20190215-0001/
6	NTAP-20190215-0001	https://security.netapp.com/advisory/ntap-20190215-0001/
OpenBSD
7	Diff for /src/usr.bin/ssh/scp.c between version 1.197 and 1.198	https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h
8	Diff for /src/usr.bin/ssh/scp.c between version 1.197 and 1.198	https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h
Ubuntu Security Notice
9	USN-3885-1	https://usn.ubuntu.com/3885-1/
10	USN-3885-1	https://usn.ubuntu.com/3885-1/
winscp
11	Top Page	https://winscp.net/eng/index.php
12	Top Page	https://winscp.net/eng/index.php

その他

No	Name	URL
関連文書
1	Bug 1665785	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-20685
2	Bug 1665785	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-20685
3	scp client multiple vulnerabilities	https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt
4	scp client multiple vulnerabilities	https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

Change Log

No	Changed Details	Date of change
1	[2019年03月07日] 掲載	March 7, 2019, 2:36 p.m.

Configuration5	or higher	or less	more than	less than
cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:::::::*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:::::::*
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:::::::*