NVD脆弱性詳細

CVE-2020-1967

概要	Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).
公表日	2020年4月21日23:15
登録日	2021年1月26日10:40
最終更新日	2024年11月21日14:11

CVSS3.1 : HIGH
スコア	7.5
ベクター	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
スコア	5.0
ベクター	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
全ての特権を取得	いいえ
ユーザー権限を取得	いいえ
その他の権限を取得	いいえ
ユーザー操作が必要	いいえ

影響を受けるソフトウェアの構成

構成1		以上	以下	より上	未満
cpe:2.3:a:openssl:openssl::::::::		1.1.1d	1.1.1f

構成2	以上	以下	より上	未満
cpe:2.3:o:debian:debian_linux:9.0:::::::*
cpe:2.3:o:debian:debian_linux:10.0:::::::*

構成3		以上	以下	より上	未満
cpe:2.3:o:freebsd:freebsd:12.1:-::::::

構成4	以上	以下	より上	未満
cpe:2.3:o:fedoraproject:fedora:30:::::::*
cpe:2.3:o:fedoraproject:fedora:31:::::::*
cpe:2.3:o:fedoraproject:fedora:32:::::::*

構成5	以上	以下	より上	未満
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.56:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:::::::*
cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:::::::*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:::::::*
cpe:2.3:a:oracle:mysql::::::::	5.7.0	5.7.30
cpe:2.3:a:oracle:mysql::::::::	8.0.0	8.0.20
cpe:2.3:a:oracle:enterprise_manager_base_platform:13.4.0.0:::::::*
cpe:2.3:a:oracle:mysql::::::::		5.6.48
cpe:2.3:a:oracle:mysql_enterprise_monitor::::::::		4.0.12
cpe:2.3:a:oracle:mysql_enterprise_monitor::::::::	8.0.0	8.0.20
cpe:2.3:a:oracle:mysql_workbench::::::::		8.0.21
cpe:2.3:a:oracle:http_server:12.2.1.4.0:::::::*
cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.3.0.0:::::::*
cpe:2.3:a:oracle:mysql_connectors::::::::		8.0.20
cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.4.0.0:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:::::::*
cpe:2.3:a:oracle:application_server:12.1.3:::::::*

構成6	以上	以下	より上	未満
cpe:2.3:a:netapp:snapcenter:-:::::::*
cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:::::::*
cpe:2.3:a:netapp:oncommand_workflow_automation:-:::::::*
cpe:2.3:a:netapp:oncommand_insight:-:::::::*
cpe:2.3:a:netapp:smi-s_provider:-:::::::*
cpe:2.3:a:netapp:active_iq_unified_manager::::::windows::*	7.3
cpe:2.3:a:netapp:active_iq_unified_manager::::::vmware_vsphere::*	9.5
cpe:2.3:a:netapp:e-series_performance_analyzer:-:::::::*
cpe:2.3:o:broadcom:fabric_operating_system:-:::::::*

構成7	以上	以下	より上	未満
cpe:2.3:o:opensuse:leap:15.1:::::::*
cpe:2.3:o:opensuse:leap:15.2:::::::*

構成8		以上	以下	より上	未満
cpe:2.3:a:jdedwards:enterpriseone::::::::					9.2.5.0

構成9		以上	以下	より上	未満
cpe:2.3:a:tenable:log_correlation_engine::::::::					6.0.9

関連情報、対策とツール

No	URL	タグ
1	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html	Mailing List Third Party Advisory
2	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html	Mailing List Third Party Advisory
3	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html	Mailing List Third Party Advisory
4	http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html	Mailing List Third Party Advisory
5	http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html	Third Party Advisory VDB Entry
6	http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html	Third Party Advisory VDB Entry
7	http://seclists.org/fulldisclosure/2020/May/5	Mailing List Third Party Advisory
8	http://seclists.org/fulldisclosure/2020/May/5	Mailing List Third Party Advisory
9	http://www.openwall.com/lists/oss-security/2020/04/22/2	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2020/04/22/2	Mailing List Third Party Advisory
11	https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1
12	https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1
13	https://github.com/irsl/CVE-2020-1967	Exploit Third Party Advisory
14	https://github.com/irsl/CVE-2020-1967	Exploit Third Party Advisory
15	https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440	Third Party Advisory
16	https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440	Third Party Advisory
17	https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3E
18	https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3E
19	https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3E
20	https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3E
21	https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3E
22	https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3E
23	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
24	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
25	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/
26	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/
27	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/
28	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/
29	https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc	Patch Third Party Advisory
30	https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc	Patch Third Party Advisory
31	https://security.gentoo.org/glsa/202004-10	Third Party Advisory
32	https://security.gentoo.org/glsa/202004-10	Third Party Advisory
33	https://security.netapp.com/advisory/ntap-20200424-0003/	Third Party Advisory
34	https://security.netapp.com/advisory/ntap-20200424-0003/	Third Party Advisory
35	https://security.netapp.com/advisory/ntap-20200717-0004/	Third Party Advisory
36	https://security.netapp.com/advisory/ntap-20200717-0004/	Third Party Advisory
37	https://www.debian.org/security/2020/dsa-4661	Third Party Advisory
38	https://www.debian.org/security/2020/dsa-4661	Third Party Advisory
39	https://www.openssl.org/news/secadv/20200421.txt	Vendor Advisory
40	https://www.openssl.org/news/secadv/20200421.txt	Vendor Advisory
41	https://www.oracle.com//security-alerts/cpujul2021.html	Patch Third Party Advisory
42	https://www.oracle.com//security-alerts/cpujul2021.html	Patch Third Party Advisory
43	https://www.oracle.com/security-alerts/cpuApr2021.html	Patch Third Party Advisory
44	https://www.oracle.com/security-alerts/cpuApr2021.html	Patch Third Party Advisory
45	https://www.oracle.com/security-alerts/cpujan2021.html	Patch Third Party Advisory
46	https://www.oracle.com/security-alerts/cpujan2021.html	Patch Third Party Advisory
47	https://www.oracle.com/security-alerts/cpujul2020.html	Third Party Advisory
48	https://www.oracle.com/security-alerts/cpujul2020.html	Third Party Advisory
49	https://www.oracle.com/security-alerts/cpuoct2020.html	Patch Third Party Advisory
50	https://www.oracle.com/security-alerts/cpuoct2020.html	Patch Third Party Advisory
51	https://www.oracle.com/security-alerts/cpuoct2021.html	Patch Third Party Advisory
52	https://www.oracle.com/security-alerts/cpuoct2021.html	Patch Third Party Advisory
53	https://www.synology.com/security/advisory/Synology_SA_20_05	Third Party Advisory
54	https://www.synology.com/security/advisory/Synology_SA_20_05	Third Party Advisory
55	https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL	Third Party Advisory
56	https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL	Third Party Advisory
57	https://www.tenable.com/security/tns-2020-03	Third Party Advisory
58	https://www.tenable.com/security/tns-2020-03	Third Party Advisory
59	https://www.tenable.com/security/tns-2020-04	Third Party Advisory
60	https://www.tenable.com/security/tns-2020-04	Third Party Advisory
61	https://www.tenable.com/security/tns-2020-11	Third Party Advisory
62	https://www.tenable.com/security/tns-2020-11	Third Party Advisory
63	https://www.tenable.com/security/tns-2021-10	Third Party Advisory
64	https://www.tenable.com/security/tns-2021-10	Third Party Advisory

共通脆弱性一覧

No	CWE	名前	URL
1	CWE-476	NULL ポインタデリファレンス	https://cwe.mitre.org/data/definitions/476.html

JVN脆弱性情報

OpenSSL における NULL ポインタ参照の脆弱性

タイトル	OpenSSL における NULL ポインタ参照の脆弱性
概要	OpenSSL には、NULL ポインタ参照の脆弱性 (CWE-476) が存在します。 OpenSSL Project より、OpenSSL Security Advisory [21 April 2020] が公開されました。深刻度 - 高 (Severity: HIGH) SSL_check_chain 関数におけるセグメンテーション違反 - CVE-2020-1967 TLS 1.3 の signature_algorithms_cert 拡張を処理する際に NULL ポインタ参照が発生するため、ハンドシェイク後の通信において SSL_check_chain() 関数が実行される際に、サーバまたはクライアントアプリケーションがクラッシュする可能性があります。
想定される影響	遠隔の第三者により細工されたメッセージを受信することによって、サービス運用妨害 (DoS) 攻撃を受ける可能性があります。
対策	[アップデートする] 本脆弱性の修正を含む次のバージョンが提供されています。開発者が提供する情報をもとに、最新版へアップデートしてください。　　* OpenSSL 1.1.1g なお、OpenSSL 1.0.2 および OpenSSL 1.1.0 は本脆弱性の影響を受けませんが、サポートが終了しているため今後アップデートを受けることができません。そのため開発者は、OpenSSL 1.0.2 のプレミアムサポートを契約したユーザを除き、OpenSSL 1.1.1 へアップグレードすることを推奨しています。
公表日	2020年4月22日0:00
登録日	2020年4月23日12:00
最終更新日	2020年4月23日12:00

影響を受けるシステム

OpenSSL Project

OpenSSL 1.1.1d

OpenSSL 1.1.1e

OpenSSL 1.1.1f

CVE (情報セキュリティ共通脆弱性識別子)

No	名前	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2020-1967	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1967

CWE (共通脆弱性タイプ一覧)

No	名前	URL
JVNDB
1	CWE-476	http://cwe.mitre.org/data/definitions/476.html

ベンダー情報

No	名前	URL
GitHub
1	Fix NULL dereference in SSL_check_chain() for TLS 1.3	https://github.com/openssl/openssl/commit/eb563247aef3e83dda7679c43f9649270462e5b1
OpenSSL Project
2	Major changes between OpenSSL 1.1.1f and OpenSSL 1.1.1g [21 Apr 2020]	https://www.openssl.org/news/openssl-1.1.1-notes.html
3	Vulnerabilities	https://www.openssl.org/news/vulnerabilities.html
OpenSSL Security Advisory
4	OpenSSL Security Advisory [21 April 2020] -- Segmentation fault in SSL_check_chain (CVE-2020-1967)	https://www.openssl.org/news/secadv/20200421.txt

その他

No	名前	URL
JPCERT 注意喚起
1	JPCERT-AT-2020-0018	https://www.jpcert.or.jp/at/2020/at200018.html
JVN
2	JVNVU#97087254	https://jvn.jp/vu/JVNVU97087254/

変更履歴

No	変更内容	変更日
1	[2020年04月23日] 掲載	2020年4月23日12:00

構成5	以上	以下	より上	未満
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.56:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.57:::::::*
cpe:2.3:a:oracle:jd_edwards_world_security:a9.4:::::::*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.4.0:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.58:::::::*
cpe:2.3:a:oracle:mysql::::::::	5.7.0	5.7.30
cpe:2.3:a:oracle:mysql::::::::	8.0.0	8.0.20
cpe:2.3:a:oracle:enterprise_manager_base_platform:13.4.0.0:::::::*
cpe:2.3:a:oracle:mysql::::::::		5.6.48
cpe:2.3:a:oracle:mysql_enterprise_monitor::::::::		4.0.12
cpe:2.3:a:oracle:mysql_enterprise_monitor::::::::	8.0.0	8.0.20
cpe:2.3:a:oracle:mysql_workbench::::::::		8.0.21
cpe:2.3:a:oracle:http_server:12.2.1.4.0:::::::*
cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.3.0.0:::::::*
cpe:2.3:a:oracle:mysql_connectors::::::::		8.0.20
cpe:2.3:a:oracle:enterprise_manager_for_storage_management:13.4.0.0:::::::*
cpe:2.3:a:oracle:peoplesoft_enterprise_peopletools:8.59:::::::*
cpe:2.3:a:oracle:application_server:12.1.3:::::::*

構成6	以上	以下	より上	未満
cpe:2.3:a:netapp:snapcenter:-:::::::*
cpe:2.3:a:netapp:steelstore_cloud_integrated_storage:-:::::::*
cpe:2.3:a:netapp:oncommand_workflow_automation:-:::::::*
cpe:2.3:a:netapp:oncommand_insight:-:::::::*
cpe:2.3:a:netapp:smi-s_provider:-:::::::*
cpe:2.3:a:netapp:active_iq_unified_manager::::::windows::*	7.3
cpe:2.3:a:netapp:active_iq_unified_manager::::::vmware_vsphere::*	9.5
cpe:2.3:a:netapp:e-series_performance_analyzer:-:::::::*
cpe:2.3:o:broadcom:fabric_operating_system:-:::::::*