GitHub Advisoryadvisory · PyPI

GHSA-cwh5-3cw7-4286 tlslite-ng off-by-one error on mac checking

HIGH Published 2018-07-12 Modified 2024-11-13 Official page ↗
Aliases
CVE-2018-1000159
Ecosystem
PyPI
Packages
tlslite-ng
Severity
High
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-354
Reviewed
2020-06-16

Affected packages

• PyPI tlslite-ng: < 0.7.4 → fixed in 0.7.4

Description

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.

Related

Alias · CVE (1)

  • CVE-2018-1000159 tlslite-ng version 0.7.3 and earlier, since commit d7b288316bca7bcdd082e6ccff5491e241305233 contains a CWE-354: Improper Validation of… vulnerability

Weakness · CWE (1)

  • CWE-354 Improper Validation of Integrity Check Value weakness

References