Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWN3aDUtM2N3Ny00Mjg2

tlslite-ng off-by-one error on mac checking

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.

Permalink: https://github.com/advisories/GHSA-cwh5-3cw7-4286
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWN3aDUtM2N3Ny00Mjg2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 6 years ago
Updated: 10 days ago

CVSS Score: 5.9
CVSS vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Identifiers: GHSA-cwh5-3cw7-4286, CVE-2018-1000159
References:

• https://nvd.nist.gov/vuln/detail/CVE-2018-1000159
• https://github.com/tomato42/tlslite-ng/pull/234
• https://github.com/tlsfuzzer/tlslite-ng/pull/234/commits/3674815d1b0f7484454995e2737a352e0a6a93d8
• https://github.com/pypa/advisory-database/tree/main/vulns/tlslite-ng/PYSEC-2018-31.yaml
• https://github.com/tlsfuzzer/tlslite-ng/commit/d7b288316bca7bcdd082e6ccff5491e241305233
• https://github.com/advisories/GHSA-cwh5-3cw7-4286

Repository: https://github.com/tomato42/tlslite-ng
Blast Radius: 12.2

Affected Packages