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CVE-2020-25659

Good to know:

Date: January 11, 2021

python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.

Language: Python

Severity Score

5.9

Related Resources (15)

Url: https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476

Url: https://access.redhat.com/security/cve/CVE-2020-25659

Url: https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b

Url: https://security.alpinelinux.org/vuln/CVE-2020-25659

Url: https://nvd.nist.gov/vuln/detail/CVE-2020-25659

Url: https://github.com/pyca/cryptography

Url: https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.yaml

Url: https://pypi.org/project/cryptography

Url: https://github.com/advisories/GHSA-hggm-jpg3-v476

Url: https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494

Url: https://security-tracker.debian.org/tracker/CVE-2020-25659

Url: https://www.oracle.com/security-alerts/cpuapr2022.html

Url: https://www.oracle.com/security-alerts/cpujul2022.html

Url: https://github.com/pyca/cryptography/pull/5507

Url: https://www.mend.io/vulnerability-database/CVE-2020-25659

Severity Score

5.9

Weakness Type (CWE)

Covert Timing Channel

CWE-385

Top Fix

Upgrade Version

Upgrade to version cryptography - 3.2

CVSS v3.1

Base Score:	5.9
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	HIGH
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	NONE
Availability (A):	NONE

CVSS v2

Base Score:	4.3
Access Vector (AV):	NETWORK
Access Complexity (AC):	MEDIUM
Authentication (AU):	NONE
Confidentiality (C):	PARTIAL
Integrity (I):	NONE
Availability (A):	NONE
Additional information:

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