NVD Vulnerability Detail

CVE-2016-1494

Summary	The verify function in the RSA package for Python (Python-RSA) before 3.3 allows attackers to spoof signatures with a small public exponent via crafted signature padding, aka a BERserk attack.
Publication Date	Jan. 14, 2016, 12:59 a.m.
Registration Date	Jan. 26, 2021, 2:07 p.m.
Last Update	Nov. 21, 2024, 11:46 a.m.

CVSS3.0 : MEDIUM
スコア	5.3
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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)	低
可用性への影響(A)	なし

CVSS2.0 : MEDIUM
Score	5.0
Vector	AV:N/AC:L/Au:N/C:N/I:P/A:N
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)	低
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:python:rsa::::::python::*					3.3

Configuration2	or higher	or less	more than	less than
cpe:2.3:o:fedoraproject:fedora:22:::::::*
cpe:2.3:o:fedoraproject:fedora:23:::::::*

Configuration3	or higher	or less	more than	less than
cpe:2.3:o:opensuse:leap:42.1:::::::*
cpe:2.3:o:opensuse:opensuse:13.1:::::::*
cpe:2.3:o:opensuse:opensuse:13.2:::::::*

Related information, measures and tools

No	URL	タグ
1	http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html	Third Party Advisory
2	http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html	Third Party Advisory
3	http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html	Third Party Advisory
4	http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html	Third Party Advisory
5	http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html	Mailing List Third Party Advisory
6	http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html	Mailing List Third Party Advisory
7	http://www.openwall.com/lists/oss-security/2016/01/05/1	Mailing List Third Party Advisory
8	http://www.openwall.com/lists/oss-security/2016/01/05/1	Mailing List Third Party Advisory
9	http://www.openwall.com/lists/oss-security/2016/01/05/3	Mailing List Third Party Advisory
10	http://www.openwall.com/lists/oss-security/2016/01/05/3	Mailing List Third Party Advisory
11	http://www.securityfocus.com/bid/79829	Third Party Advisory VDB Entry
12	http://www.securityfocus.com/bid/79829	Third Party Advisory VDB Entry
13	https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff	Patch Third Party Advisory
14	https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff	Patch Third Party Advisory
15	https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/	Exploit Third Party Advisory
16	https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/	Exploit Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-20	不適切な入力確認	https://cwe.mitre.org/data/definitions/20.html

JVN Vulnerability Information

Python 用 RSA パッケージの verify 関数における過度に小さな公開指数を持つ署名を偽造される脆弱性

Title	Python 用 RSA パッケージの verify 関数における過度に小さな公開指数を持つ署名を偽造される脆弱性
Summary	Python (Python-RSA) 用 RSA パッケージの verify 関数には、過度に小さな公開指数を持つ署名を偽造される脆弱性が存在します。本脆弱性は、BERserk 攻撃と呼ばれています。
Possible impacts	攻撃者により、巧妙に細工された署名のパディングを介して、過度に小さな公開指数を持つ署名を偽造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	Jan. 13, 2016, midnight
Registration Date	Jan. 18, 2016, 2:57 p.m.
Last Update	Jan. 18, 2016, 2:57 p.m.

Affected System

Python Software Foundation

Python (Python-RSA) 3.3 未満

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-2016-1494	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1494
2	CVE-2016-1494	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1494
National Vulnerability Database (NVD)
3	CVE-2016-1494	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-1494
4	CVE-2016-1494	http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-1494

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-20	https://jvndb.jvn.jp/ja/cwe/CWE-20.html
2	CWE-20	https://jvndb.jvn.jp/ja/cwe/CWE-20.html

ベンダー情報

No	Name	URL
Bitbucket
1	[security] Fix BB'06 attack in verify() by switching from parsing to comparison	https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff
2	[security] Fix BB'06 attack in verify() by switching from parsing to comparison	https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff

Change Log

No	Changed Details	Date of change
0	[2016年01月18日] 掲載	Feb. 17, 2018, 10:37 a.m.
0	[2016年01月18日] 掲載	Feb. 17, 2018, 10:37 a.m.