CVE-2020-26263

Published: Dic 21, 2020 Last Modified: Nov 21, 2024 EU-VD ID: EUVD-2020-0221 Aliases: GHSA-wvcv-832q-fjg7, PYSEC-2020-143
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: none
Integrity: high
Availability: none
MEDIUM 5,0
Source: [email protected]
Access Vector: network
Access Complexity: low
Authentication: none
Confidentiality: partial
Integrity: none
Availability: none

Description

AI Translation Available

tlslite-ng is an open source python library that implements SSL and TLS cryptographic protocols. In tlslite-ng before versions 0.7.6 and 0.8.0-alpha39, the code that performs decryption and padding check in RSA PKCS#1 v1.5 decryption is data dependant. In particular, the code has multiple ways in which it leaks information about the decrypted ciphertext. It aborts as soon as the plaintext doesn't start with 0x00, 0x02. All TLS servers that enable RSA key exchange as well as applications that use the RSA decryption API directly are vulnerable. This is patched in versions 0.7.6 and 0.8.0-alpha39. Note: the patches depend on Python processing the individual bytes in side-channel free manner, this is known to not the case (see reference). As such, users that require side-channel resistance are recommended to use different TLS implementations, as stated in the security policy of tlslite-ng.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0024
Percentile
0,5th
Updated

EPSS Score Trend (Last 90 Days)

326

Inadequate Encryption Strength

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Access Control Confidentiality
Potential Impacts:
Bypass Protection Mechanism Read Application Data
Applicable Platforms
All platforms may be affected
View CWE Details
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha31:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha38:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha22:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha29:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha4:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha20:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha7:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha19:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha9:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha3:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha1:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha34:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha6:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha32:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha14:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha15:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha5:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha27:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha21:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha28:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha33:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha10:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha8:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha23:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha25:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha18:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version Range Affected
To 0.7.6 (exclusive)
cpe:2.3:a:tlslite-ng_project:tlslite-ng:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha2:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha12:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha11:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha30:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha26:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha24:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha36:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha16:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha13:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha17:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha37:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Tlslite-Ng by Tlslite-Ng Project

Product Information
Vendor Tlslite-Ng Project
Product Tlslite-Ng
Version 0.8.0
cpe:2.3:a:tlslite-ng_project:tlslite-ng:0.8.0:alpha35:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba…
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba59d8bd5cb3ba15edc42e…
https://github.com/tlsfuzzer/tlslite-ng/pull/438
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/pull/438
https://github.com/tlsfuzzer/tlslite-ng/pull/439
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/pull/439
https://github.com/tlsfuzzer/tlslite-ng/security/advisories…
Exploit Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/security/advisories/GHSA-wvcv-832q-fjg7
https://pypi.org/project/tlslite-ng/
Product Third Party Advisory
https://pypi.org/project/tlslite-ng/
https://securitypitfalls.wordpress.com/2018/08/03/constant-…
Exploit Third Party Advisory
https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-pyth…
https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba…
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/commit/c28d6d387bba59d8bd5cb3ba15edc42e…
https://github.com/tlsfuzzer/tlslite-ng/pull/438
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/pull/438
https://github.com/tlsfuzzer/tlslite-ng/pull/439
Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/pull/439
https://github.com/tlsfuzzer/tlslite-ng/security/advisories…
Exploit Patch Third Party Advisory
https://github.com/tlsfuzzer/tlslite-ng/security/advisories/GHSA-wvcv-832q-fjg7
https://pypi.org/project/tlslite-ng/
Product Third Party Advisory
https://pypi.org/project/tlslite-ng/
https://securitypitfalls.wordpress.com/2018/08/03/constant-…
Exploit Third Party Advisory
https://securitypitfalls.wordpress.com/2018/08/03/constant-time-compare-in-pyth…