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CVE-2018-1000159

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Date: April 18, 2018

tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of Integrity Check Value vulnerability in TLS implementation, tlslite/utils/constanttime.py: ct_check_cbc_mac_and_pad(); line "end_pos = data_len - 1 - mac.digest_size" that can result in an attacker manipulating the TLS ciphertext which will not be detected by receiving tlslite-ng. This attack appears to be exploitable via man in the middle on a network connection. This vulnerability appears to have been fixed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.

Language: Python

Severity Score

Related Resources (7)

https://github.com/pypa/advisory-database/tree/main/vulns/tlslite-ng/PYSEC-2018-31.yaml
https://nvd.nist.gov/vuln/detail/CVE-2018-1000159
https://github.com/advisories/GHSA-cwh5-3cw7-4286
https://github.com/tomato42/tlslite-ng/pull/234
https://github.com/tlsfuzzer/tlslite-ng/pull/234/commits/3674815d1b0f7484454995e2737a352e0a6a93d8
https://github.com/tomato42/tlslite-ng
https://www.mend.io/vulnerability-database/CVE-2018-1000159

Severity Score

Weakness Type (CWE)

Input Validation

CWE-20

Improper Validation of Integrity Check Value

CWE-354

Top Fix

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CVSS v3.1

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

CVSS v2

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

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