NVD Vulnerability Detail

CVE-2023-25136

Summary	OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."
Publication Date	Feb. 3, 2023, 3:15 p.m.
Registration Date	Feb. 4, 2023, 10 a.m.
Last Update	Nov. 21, 2024, 4:49 p.m.

CVSS3.1 : MEDIUM
スコア	6.5
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
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)	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)	低
可用性への影響(A)	高

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:a:openbsd:openssh:9.1:::::::*

Configuration2	or higher	or less	more than	less than
cpe:2.3:o:fedoraproject:fedora:37:::::::*
cpe:2.3:o:fedoraproject:fedora:38:::::::*

Configuration3		or higher	or less	more than	less than
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:::::::*

Configuration4		or higher	or less	more than	less than
cpe:2.3:o:netapp:a250_firmware:-:::::::*
execution environment
1	cpe:2.3:h:netapp:a250:-:::::::*

Configuration5		or higher	or less	more than	less than
cpe:2.3:o:netapp:500f_firmware:-:::::::*
execution environment
1	cpe:2.3:h:netapp:500f:-:::::::*

Configuration6		or higher	or less	more than	less than
cpe:2.3:o:netapp:c250_firmware:-:::::::*
execution environment
1	cpe:2.3:h:netapp:c250:-:::::::*

Related information, measures and tools

No	URL	タグ
1	http://www.openwall.com/lists/oss-security/2023/02/13/1	Mailing List Third Party Advisory
2	http://www.openwall.com/lists/oss-security/2023/02/13/1	Mailing List Third Party Advisory
3	http://www.openwall.com/lists/oss-security/2023/02/22/1	Mailing List Third Party Advisory
4	http://www.openwall.com/lists/oss-security/2023/02/22/1	Mailing List Third Party Advisory
5	http://www.openwall.com/lists/oss-security/2023/02/22/2	Mailing List Third Party Advisory
6	http://www.openwall.com/lists/oss-security/2023/02/22/2	Mailing List Third Party Advisory
7	http://www.openwall.com/lists/oss-security/2023/02/23/3	Mailing List Third Party Advisory
8	http://www.openwall.com/lists/oss-security/2023/02/23/3	Mailing List Third Party Advisory
9	http://www.openwall.com/lists/oss-security/2023/03/06/1	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2023/03/06/1	Mailing List Third Party Advisory
11	http://www.openwall.com/lists/oss-security/2023/03/09/2	Mailing List Third Party Advisory
12	http://www.openwall.com/lists/oss-security/2023/03/09/2	Mailing List Third Party Advisory
13	https://bugzilla.mindrot.org/show_bug.cgi?id=3522	Exploit Issue Tracking Third Party Advisory
14	https://bugzilla.mindrot.org/show_bug.cgi?id=3522	Exploit Issue Tracking Third Party Advisory
15	https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig	Patch Vendor Advisory
16	https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig	Patch Vendor Advisory
17	https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946	Patch Third Party Advisory
18	https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946	Patch Third Party Advisory
19	https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/	Exploit Third Party Advisory
20	https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-concept/	Exploit Third Party Advisory
21	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
22	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
23	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
24	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
25	https://news.ycombinator.com/item?id=34711565	Issue Tracking Third Party Advisory
26	https://news.ycombinator.com/item?id=34711565	Issue Tracking Third Party Advisory
27	https://security.gentoo.org/glsa/202307-01	Third Party Advisory
28	https://security.gentoo.org/glsa/202307-01	Third Party Advisory
29	https://security.netapp.com/advisory/ntap-20230309-0003/	Third Party Advisory
30	https://security.netapp.com/advisory/ntap-20230309-0003/	Third Party Advisory
31	https://www.openwall.com/lists/oss-security/2023/02/02/2	Exploit Mailing List Third Party Advisory
32	https://www.openwall.com/lists/oss-security/2023/02/02/2	Exploit Mailing List Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-415	二重解放	https://cwe.mitre.org/data/definitions/415.html

JVN Vulnerability Information

OpenSSH サーバにおける二重解放に関する脆弱性

Title	OpenSSH サーバにおける二重解放に関する脆弱性
Summary	OpenSSH サーバ (sshd) には、二重解放に関する脆弱性が存在します。
Possible impacts	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	Feb. 2, 2023, midnight
Registration Date	Sept. 1, 2023, 9:13 a.m.
Last Update	Dec. 21, 2023, 11:43 a.m.

Affected System

OpenBSD

OpenSSH 9.1

Fedora Project

Fedora

NetApp

500F ファームウェア

A250 ファームウェア

C250 ファームウェア

ONTAP Select Deploy administration utility

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-2023-25136	https://www.cve.org/CVERecord?id=CVE-2023-25136
National Vulnerability Database (NVD)
2	CVE-2023-25136	https://nvd.nist.gov/vuln/detail/CVE-2023-25136

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-415	https://cwe.mitre.org/data/definitions/415.html

ベンダー情報

No	Name	URL
Fedora Update Notification
1	FEDORA-2023-1176c8b10c	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R7LKQDFZWKYHQ65TBSH2X2HJQ4V2THS3/
2	FEDORA-2023-123647648e	https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JGAUIXJ3TEKCRKVWFQ6GDAGQFTIIGQQP/
GitHub
3	Commit	https://github.com/openssh/openssh-portable/commit/486c4dc3b83b4b67d663fb0fa62bc24138ec3946
NetApp Advisory
4	NTAP-20230309-0003	https://security.netapp.com/advisory/ntap-20230309-0003/
OpenBSD
5	017_sshd.patch.sig	https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/017_sshd.patch.sig

その他

No	Name	URL
ICS-CERT ADVISORY
1	ICSA-23-348-10	https://www.cisa.gov/news-events/ics-advisories/icsa-23-348-10
JVN
2	JVNVU#98271228	https://jvn.jp/vu/JVNVU98271228/index.html
関連文書
3	34711565 (Hacker News)	https://news.ycombinator.com/item?id=34711565
4	Bug 3522 - Crash with "free(): double free detected" with old clients	https://bugzilla.mindrot.org/show_bug.cgi?id=3522
5	double-free vulnerability in OpenSSH server 9.1	https://www.openwall.com/lists/oss-security/2023/02/02/2
6	Re: Re: double-free vulnerability in OpenSSH server 9.1 (CVE-2023-25136)	https://www.openwall.com/lists/oss-security/2023/03/09/2

Change Log

No	Changed Details	Date of change
1	[2023年09月01日] 掲載	Sept. 1, 2023, 9:13 a.m.
2	[2023年12月21日] 参考情報：JVN (JVNVU#98271228) を追加参考情報：ICS-CERT ADVISORY (ICSA-23-348-10) を追加	Dec. 21, 2023, 10:48 a.m.