CVE-2016-1494 : The verify function in the RSA package for Python (Python-RSA) before 3.3 allows

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.

Published 2016-01-13 15:59:03

Updated 2019-05-31 17:27:07

Source MITRE

View at NVD, CVE.org

Vulnerability category: Input validation

Products affected by CVE-2016-1494

Fedoraproject » Fedora » Version: 22
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 23
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
Matching versions
Opensuse » Opensuse » Version: 13.2
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
Matching versions
Opensuse » Opensuse » Version: 13.1
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
Matching versions
Opensuse » Leap » Version: 42.1
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
Matching versions
Python » RSA » For Python
Versions before (<) 3.3
cpe:2.3:a:python:rsa:*:*:*:*:*:python:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2016-1494

EPSS FAQ

0.43%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 75 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2016-1494

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:P/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.3	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N	3.9	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

CWE ids for CVE-2016-1494

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2016-1494

http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175897.html

[SECURITY] Fedora 23 Update: python-rsa-3.3-2.fc23
Third Party Advisory
http://www.securityfocus.com/bid/79829

Python-RSA CVE-2016-1494 Security Bypass Vulnerability
Third Party Advisory;VDB Entry
http://lists.opensuse.org/opensuse-updates/2016-01/msg00032.html

openSUSE-SU-2016:0108-1: moderate: Security update for python-rsa
Mailing List;Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/01/05/1

oss-security - CVE Request: python-rsa signature forgery
Mailing List;Third Party Advisory
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/175942.html

[SECURITY] Fedora 22 Update: python-rsa-3.3-2.fc22
Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/01/05/3

oss-security - Re: CVE Request: python-rsa signature forgery
Mailing List;Third Party Advisory
https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/

Bleichenbacher'06 signature forgery in python-rsa
Exploit;Third Party Advisory
https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by/diff

sybren / python-rsa / Pull request #14: [security] Fix BB'06 attack in verify() by switching from parsing to comparison — Bitbucket
Patch;Third Party Advisory

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Vulnerability Details : CVE-2016-1494

Products affected by CVE-2016-1494

Exploit prediction scoring system (EPSS) score for CVE-2016-1494

CVSS scores for CVE-2016-1494

CWE ids for CVE-2016-1494

References for CVE-2016-1494