NVD Vulnerability Detail

CVE-2020-15900

Summary	A memory corruption issue was found in Artifex Ghostscript 9.50 and 9.52. Use of a non-standard PostScript operator can allow overriding of file access controls. The 'rsearch' calculation for the 'post' size resulted in a size that was too large, and could underflow to max uint32_t. This was fixed in commit 5d499272b95a6b890a1397e11d20937de000d31b.
Publication Date	July 29, 2020, 1:15 a.m.
Registration Date	Jan. 26, 2021, 11:53 a.m.
Last Update	Nov. 21, 2024, 2:06 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	7.5
Vector	AV:N/AC:L/Au:N/C:P/I:P/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)	低
完全性への影響(I)	低
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:artifex:ghostscript:9.52:::::::*
cpe:2.3:a:artifex:ghostscript:9.50:::::::*

Configuration2		or higher	or less	more than	less than
cpe:2.3:o:canonical:ubuntu_linux:20.04::::lts:::

Configuration3	or higher	or less	more than	less than
cpe:2.3:o:opensuse:leap:15.1:::::::*
cpe:2.3:o:opensuse:leap:15.2:::::::*

Related information, measures and tools

No	URL	タグ
1	http://git.ghostscript.com/?p=ghostpdl.git%3Ba=log
2	http://git.ghostscript.com/?p=ghostpdl.git%3Ba=log
3	http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00004.html	Mailing List Third Party Advisory
4	http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00004.html	Mailing List Third Party Advisory
5	http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00006.html	Mailing List Third Party Advisory
6	http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00006.html	Mailing List Third Party Advisory
7	https://artifex.com/security-advisories/CVE-2020-15900	Vendor Advisory
8	https://artifex.com/security-advisories/CVE-2020-15900	Vendor Advisory
9	https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=5d499272b95a6b890a1397e11d20937de000d31b
10	https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=5d499272b95a6b890a1397e11d20937de000d31b
11	https://github.com/ArtifexSoftware/ghostpdl/commit/5d499272b95a6b890a1397e11d20937de000d31b	Patch Third Party Advisory
12	https://github.com/ArtifexSoftware/ghostpdl/commit/5d499272b95a6b890a1397e11d20937de000d31b	Patch Third Party Advisory
13	https://github.com/ArtifexSoftware/ghostpdl/commits/master/psi/zstring.c	Patch Third Party Advisory
14	https://github.com/ArtifexSoftware/ghostpdl/commits/master/psi/zstring.c	Patch Third Party Advisory
15	https://security.gentoo.org/glsa/202008-20	Third Party Advisory
16	https://security.gentoo.org/glsa/202008-20	Third Party Advisory
17	https://usn.ubuntu.com/4445-1/	Third Party Advisory
18	https://usn.ubuntu.com/4445-1/	Third Party 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
2	CWE-191	整数アンダーフロー	https://cwe.mitre.org/data/definitions/191.html

JVN Vulnerability Information

Artifex Ghostscript におけるバッファエラーの脆弱性

Title	Artifex Ghostscript におけるバッファエラーの脆弱性
Summary	Artifex Ghostscript には、バッファエラーの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	July 27, 2020, midnight
Registration Date	Sept. 28, 2020, 4:57 p.m.
Last Update	Sept. 28, 2020, 4:57 p.m.

Affected System

Artifex Software

Ghostscript 9.50

Ghostscript 9.52

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-2020-15900	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15900
National Vulnerability Database (NVD)
2	CVE-2020-15900	https://nvd.nist.gov/vuln/detail/CVE-2020-15900
Security Advisories
3	CVE-2020-15900	https://artifex.com/security-advisories/CVE-2020-15900

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-119	https://jvndb.jvn.jp/ja/cwe/CWE-119.html

ベンダー情報

No	Name	URL
Git
1	Bug 702582, CVE 2020-15900 Memory Corruption in Ghostscript 9.52	https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5d499272b95a6b890a1397e11d20937de000d31b
2	projects / ghostpdl.git / log	http://git.ghostscript.com/?p=ghostpdl.git;a=log
GitHub
3	Bug 702582, CVE 2020-15900 Memory Corruption in Ghostscript 9.52	https://github.com/ArtifexSoftware/ghostpdl/commit/5d499272b95a6b890a1397e11d20937de000d31b
4	History for ghostpdl/psi/zstring.c	https://github.com/ArtifexSoftware/ghostpdl/commits/master/psi/zstring.c

Change Log

No	Changed Details	Date of change
1	[2020年09月28日] 掲載	Sept. 28, 2020, 4:57 p.m.