NVD Vulnerability Detail

CVE-2020-8794

Summary	OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.
Publication Date	Feb. 26, 2020, 2:15 a.m.
Registration Date	Jan. 26, 2021, 12:02 p.m.
Last Update	Nov. 21, 2024, 2:39 p.m.

CVSS3.1 : CRITICAL
スコア	9.8
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	低
攻撃に必要な特権レベル(PR)	不要
利用者の関与(UI)	不要
影響の想定範囲(S)	変更なし
機密性への影響(C)	高
完全性への影響(I)	高
可用性への影響(A)	高

CVSS2.0 : HIGH
Score	10.0
Vector	AV:N/AC:L/Au:N/C:C/I:C/A:C
攻撃元区分(AV)	ネットワーク
攻撃条件の複雑さ(AC)	低
攻撃前の認証要否(Au)	不要
機密性への影響(C)	高
完全性への影響(I)	高
可用性への影響(A)	高
Get all privileges.	いいえ
Get user privileges	いいえ
Get other privileges	いいえ
User operation required	いいえ

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:opensmtpd:opensmtpd::::::::					6.6.4

Configuration2	or higher	or less	more than	less than
cpe:2.3:o:canonical:ubuntu_linux:18.04::::lts:::
cpe:2.3:o:canonical:ubuntu_linux:19.10:::::::*

Configuration3	or higher	or less	more than	less than
cpe:2.3:o:fedoraproject:fedora:31:::::::*
cpe:2.3:o:fedoraproject:fedora:32:::::::*

Configuration4	or higher	or less	more than	less than
cpe:2.3:o:debian:debian_linux:9.0:::::::*
cpe:2.3:o:debian:debian_linux:10.0:::::::*

Related information, measures and tools

No	URL	タグ
1	http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html	Exploit Third Party Advisory VDB Entry
2	http://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html	Exploit Third Party Advisory VDB Entry
3	http://seclists.org/fulldisclosure/2020/Feb/32	Mailing List Third Party Advisory
4	http://seclists.org/fulldisclosure/2020/Feb/32	Mailing List Third Party Advisory
5	http://www.openwall.com/lists/oss-security/2020/02/26/1	Exploit Mailing List Third Party Advisory
6	http://www.openwall.com/lists/oss-security/2020/02/26/1	Exploit Mailing List Third Party Advisory
7	http://www.openwall.com/lists/oss-security/2020/03/01/1	Mailing List Third Party Advisory
8	http://www.openwall.com/lists/oss-security/2020/03/01/1	Mailing List Third Party Advisory
9	http://www.openwall.com/lists/oss-security/2020/03/01/2	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2020/03/01/2	Mailing List Third Party Advisory
11	http://www.openwall.com/lists/oss-security/2021/05/04/7	Exploit Mailing List Third Party Advisory
12	http://www.openwall.com/lists/oss-security/2021/05/04/7	Exploit Mailing List Third Party Advisory
13	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
14	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/
15	https://usn.ubuntu.com/4294-1/	Patch Third Party Advisory
16	https://usn.ubuntu.com/4294-1/	Patch Third Party Advisory
17	https://www.debian.org/security/2020/dsa-4634	Third Party Advisory
18	https://www.debian.org/security/2020/dsa-4634	Third Party Advisory
19	https://www.openbsd.org/security.html	Third Party Advisory
20	https://www.openbsd.org/security.html	Third Party Advisory
21	https://www.openwall.com/lists/oss-security/2020/02/24/5	Exploit Mailing List Third Party Advisory
22	https://www.openwall.com/lists/oss-security/2020/02/24/5	Exploit Mailing List Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-125	境界外読み取り	https://cwe.mitre.org/data/definitions/125.html

JVN Vulnerability Information

OpenSMTPD における境界外読み取りに関する脆弱性

Title	OpenSMTPD における境界外読み取りに関する脆弱性
Summary	OpenSMTPD には、境界外読み取りに関する脆弱性が存在します。
Possible impacts	情報を取得される、情報を改ざんされる、およびサービス運用妨害 (DoS) 状態にされる可能性があります。
Solution	ベンダ情報および参考情報を参照して適切な対策を実施してください。
Publication Date	Feb. 24, 2020, midnight
Registration Date	March 6, 2020, 3:15 p.m.
Last Update	March 6, 2020, 3:15 p.m.

Affected System

OpenBSD

OpenSMTPD 6.6.4 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-2020-8794	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8794
National Vulnerability Database (NVD)
2	CVE-2020-8794	https://nvd.nist.gov/vuln/detail/CVE-2020-8794

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-125	https://cwe.mitre.org/data/definitions/125.html

ベンダー情報

No	Name	URL
OpenBSD
1	OpenBSD Security	https://www.openbsd.org/security.html

その他

No	Name	URL
関連文書
1	LPE and RCE in OpenSMTPD's default install (CVE-2020-8794)	https://www.openwall.com/lists/oss-security/2020/02/24/5

Change Log

No	Changed Details	Date of change
1	[2020年03月06日] 掲載	March 6, 2020, 3:15 p.m.