CVE Vulnerabilities

CVE-2013-1895

Improper Restriction of Excessive Authentication Attempts

Published: Jan 28, 2020 | Modified: Feb 04, 2020
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM

The py-bcrypt module before 0.3 for Python does not properly handle concurrent memory access, which allows attackers to bypass authentication via multiple authentication requests, which trigger the password hash to be overwritten.

Weakness

The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks.

Affected Software

Name Vendor Start Version End Version
Py-bcrypt Python * 0.3 (excluding)
Python-bcrypt Ubuntu oneiric *
Python-bcrypt Ubuntu quantal *
Python-bcrypt Ubuntu raring *
Python-bcrypt Ubuntu saucy *
Python-bcrypt Ubuntu upstream *

Potential Mitigations

  • Common protection mechanisms include:

  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.

  • Consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator. [REF-45]

References