NVD Vulnerability Detail

CVE-2020-1476

Summary	An elevation of privilege vulnerability exists when ASP.NET or .NET web applications running on IIS improperly allow access to cached files. An attacker who successfully exploited this vulnerability could gain access to restricted files. To exploit this vulnerability, an attacker would need to send a specially crafted request to an affected server. The update addresses the vulnerability by changing how ASP.NET and .NET handle requests.
Publication Date	Aug. 18, 2020, 4:15 a.m.
Registration Date	Jan. 26, 2021, 11:52 a.m.
Last Update	Nov. 21, 2024, 2:10 p.m.

CVSS3.1 : MEDIUM
スコア	5.5
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
攻撃元区分(AV)	ローカル
攻撃条件の複雑さ(AC)	低
攻撃に必要な特権レベル(PR)	低
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)	なし
可用性への影響(A)	なし

CVSS2.0 : LOW
Score	2.1
Vector	AV:L/AC:L/Au:N/C:P/I:N/A:N
攻撃元区分(AV)	ローカル
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)	低
完全性への影響(I)	なし
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	いいえ

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:2.0:sp2::::::
execution environment
1	cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::

Configuration2		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
2	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
3	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration3		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1607:::::::*
2	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Configuration4		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:-:::::::*

Configuration5		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1709:::::::*

Configuration6		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1803:::::::*
2	cpe:2.3:o:microsoft:windows_10:1809:::::::*
3	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration7		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1809:::::::*
2	cpe:2.3:o:microsoft:windows_10:1903:::::::*
3	cpe:2.3:o:microsoft:windows_10:1909:::::::*
4	cpe:2.3:o:microsoft:windows_10:2004:::::::*
5	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration8		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5.1:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_7:sp1:::::::*
2	cpe:2.3:o:microsoft:windows_server_2008:r2:::::::*

Configuration9		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.5.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
2	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
3	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
4	cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::
5	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
6	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
7	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration10		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.6:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::

Configuration11		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.6:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
2	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
3	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
4	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
5	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
6	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration12		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1607:::::::*
2	cpe:2.3:o:microsoft:windows_10:1709:::::::*
3	cpe:2.3:o:microsoft:windows_10:1803:::::::*
4	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
5	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
6	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
7	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
8	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
9	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
10	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Related information, measures and tools

No	URL	refsource	タグ
1	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476		Patch Vendor Advisory
2	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1476		Patch Vendor Advisory

Common Vulnerabilities List

JVN Vulnerability Information

Microsoft .NET Framework における権限を昇格される脆弱性

Title	Microsoft .NET Framework における権限を昇格される脆弱性
Summary	Microsoft .NET Framework には、IIS 上で実行されている ASP.NET または .NET Web アプリケーションで、キャッシュファイルへのアクセスが適切に許可されていない場合、権限を昇格される脆弱性が存在します。ベンダは、本脆弱性を「ASP.NET および .NET の特権の昇格の脆弱性」として公開しています。
Possible impacts	権限を昇格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	Aug. 11, 2020, midnight
Registration Date	Sept. 15, 2020, 1:51 p.m.
Last Update	Sept. 15, 2020, 1:51 p.m.

Affected System

マイクロソフト

Microsoft .NET Framework 2.0 SP2

Microsoft .NET Framework 3.5

Microsoft .NET Framework 3.5.1

Microsoft .NET Framework 4.5.2

Microsoft .NET Framework 4.6

Microsoft .NET Framework 4.6.1

Microsoft .NET Framework 4.6.2

Microsoft .NET Framework 4.7

Microsoft .NET Framework 4.7.1

Microsoft .NET Framework 4.7.2

Microsoft .NET Framework 4.8

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-2020-1476	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1476
National Vulnerability Database (NVD)
2	CVE-2020-1476	https://nvd.nist.gov/vuln/detail/CVE-2020-1476
Security Update Guide
3	CVE-2020-1476 \| ASP.NET and .NET Elevation of Privilege Vulnerability	https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2020-1476
セキュリティ更新プログラムガイド
4	CVE-2020-1476 \| ASP.NET および .NET の特権の昇格の脆弱性	https://portal.msrc.microsoft.com/ja-jp/security-guidance/advisory/CVE-2020-1476

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-269	https://cwe.mitre.org/data/definitions/269.html

その他

No	Name	URL
IPA 重要なセキュリティ情報
1	Microsoft 製品の脆弱性対策について(2020年8月)	https://www.ipa.go.jp/security/ciadr/vul/20200812-ms.html
JPCERT 注意喚起
2	JPCERT-AT-2020-0033	https://www.jpcert.or.jp/at/2020/at200033.html

Change Log

No	Changed Details	Date of change
1	[2020年09月15日] 掲載	Sept. 15, 2020, 1:51 p.m.

Configuration3		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1607:::::::*
2	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*

Configuration7		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:3.5:::::::*
cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1809:::::::*
2	cpe:2.3:o:microsoft:windows_10:1903:::::::*
3	cpe:2.3:o:microsoft:windows_10:1909:::::::*
4	cpe:2.3:o:microsoft:windows_10:2004:::::::*
5	cpe:2.3:o:microsoft:windows_server_2019:-:::::::*

Configuration9		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.5.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
2	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
3	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
4	cpe:2.3:o:microsoft:windows_server_2008:-:sp2::::::
5	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
6	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
7	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration11		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.6:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.6.2:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.1:::::::*
cpe:2.3:a:microsoft:.net_framework:4.7.2:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
2	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
3	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
4	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
5	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
6	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*

Configuration12		or higher	or less	more than	less than
cpe:2.3:a:microsoft:.net_framework:4.8:::::::*
execution environment
1	cpe:2.3:o:microsoft:windows_10:1607:::::::*
2	cpe:2.3:o:microsoft:windows_10:1709:::::::*
3	cpe:2.3:o:microsoft:windows_10:1803:::::::*
4	cpe:2.3:o:microsoft:windows_7:-:sp1::::::
5	cpe:2.3:o:microsoft:windows_8.1:-:::::::*
6	cpe:2.3:o:microsoft:windows_rt_8.1:-:::::::*
7	cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:::::x64:*
8	cpe:2.3:o:microsoft:windows_server_2012:-:::::::*
9	cpe:2.3:o:microsoft:windows_server_2012:r2:::::::*
10	cpe:2.3:o:microsoft:windows_server_2016:-:::::::*