NVD Vulnerability Detail

CVE-2021-20277

Summary	A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.
Publication Date	May 12, 2021, 11:15 p.m.
Registration Date	May 13, 2021, 10 a.m.
Last Update	Nov. 21, 2024, 2:46 p.m.

CVSS3.1 : HIGH
スコア	7.5
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)	なし
完全性への影響(I)	なし
可用性への影響(A)	高

CVSS2.0 : MEDIUM
Score	5.0
Vector	AV:N/AC:L/Au:N/C:N/I:N/A:P
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)	なし
完全性への影響(I)	なし
可用性への影響(A)	低
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:samba:samba::::::::	4.14.0			4.14.1
cpe:2.3:a:samba:samba::::::::	4.13.0			4.13.6
cpe:2.3:a:samba:samba::::::::	4.0.0			4.12.13

Configuration2	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:::::::*

Configuration3	or higher	or less	more than	less than
cpe:2.3:o:fedoraproject:fedora:32:::::::*
cpe:2.3:o:fedoraproject:fedora:33:::::::*
cpe:2.3:o:fedoraproject:fedora:34:::::::*

Related information, measures and tools

No	URL	タグ
1	https://bugzilla.redhat.com/show_bug.cgi?id=1941402	Issue Tracking Third Party Advisory
2	https://bugzilla.redhat.com/show_bug.cgi?id=1941402	Issue Tracking Third Party Advisory
3	https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html	Mailing List Third Party Advisory
4	https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html	Mailing List Third Party Advisory
5	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
6	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
7	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
8	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
9	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
10	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
11	https://security.gentoo.org/glsa/202105-22	Third Party Advisory
12	https://security.gentoo.org/glsa/202105-22	Third Party Advisory
13	https://security.netapp.com/advisory/ntap-20210326-0007/	Third Party Advisory
14	https://security.netapp.com/advisory/ntap-20210326-0007/	Third Party Advisory
15	https://www.debian.org/security/2021/dsa-4884	Third Party Advisory
16	https://www.debian.org/security/2021/dsa-4884	Third Party Advisory
17	https://www.samba.org/samba/security/CVE-2021-20277.html	Vendor Advisory
18	https://www.samba.org/samba/security/CVE-2021-20277.html	Vendor Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-787	境界外書き込み	https://cwe.mitre.org/data/definitions/787.html

JVN Vulnerability Information

Samba における境界外読み取りに関する脆弱性

Title	Samba における境界外読み取りに関する脆弱性
Summary	Samba には、境界外読み取りに関する脆弱性が存在します。
Possible impacts	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	March 22, 2021, midnight
Registration Date	Jan. 24, 2022, 6:01 p.m.
Last Update	Jan. 24, 2022, 6:01 p.m.

Affected System

Samba Project

Samba

Debian

Debian GNU/Linux

Fedora Project

Fedora

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-2021-20277	https://www.cve.org/CVERecord?id=CVE-2021-20277
National Vulnerability Database (NVD)
2	CVE-2021-20277	https://nvd.nist.gov/vuln/detail/CVE-2021-20277

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
Debian
1	[SECURITY] [DLA 2611-1] ldb security update	https://lists.debian.org/debian-lts-announce/2021/03/msg00036.html
Debian Security Advisory
2	DSA-4884-1	https://www.debian.org/security/2021/dsa-4884
Fedora Update Notification
3	FEDORA-2021-a8e93a285	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/
4	FEDORA-2021-c2d8628d33	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/
5	FEDORA-2021-c93a3a5d3f	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/
Samba
6	Out of bounds read in AD DC LDAP server	https://www.samba.org/samba/security/CVE-2021-20277.html

その他

No	Name	URL
関連文書
1	Bug 1941402 (CVE-2021-20277) - CVE-2021-20277 samba: Out of bounds read in AD DC LDAP server	https://bugzilla.redhat.com/show_bug.cgi?id=1941402

Change Log

No	Changed Details	Date of change
1	[2022年01月24日] 掲載	Jan. 24, 2022, 6:01 p.m.