PT-2020-7373 · Pypi · Py-Bcrypt

Kurt Seifried · Published 2020-01-28 · Updated 2021-10-12 · CVE-2013-1895

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions: py-bcrypt versions prior to 0.3

Description: The issue arises from improper handling of concurrent memory access in the py-bcrypt module, allowing attackers to bypass authentication. This is achieved through multiple authentication requests that trigger the password hash to be overwritten.

Recommendations: For versions prior to 0.3, update to version 0.3 or later to resolve the issue. As a temporary workaround, consider implementing synchronization mechanisms to prevent concurrent access to the password hash. Restrict access to authentication endpoints to minimize the risk of exploitation.

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-307

Related Identifiers

CVE-2013-1895

GHSA-R838-Q6JP-58XX

PYSEC-2020-249

Affected Products

Py-Bcrypt

References · 18

• https://osv.dev/vulnerability/DEBIAN-CVE-2013-1895 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2020-249 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-r838-q6jp-58xx · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2013-1895 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2013-1895 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2013-1895 · Security Note
• https://ubuntu.com/security/CVE-2013-1895 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2013-1895 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2013-1895 · Vendor Advisory
• https://github.com/pypa/advisory-database/tree/main/vulns/py-bcrypt/PYSEC-2020-249.yaml · Note
• https://github.com/grnet/python-bcrypt · Note
• http://openwall.com/lists/oss-security/2013/03/26/2 · Note
• https://github.com/advisories/GHSA-r838-q6jp-58xx · Note
• http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101382.html · Note
• http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101387.html · Note