tomato42/tlslite-ng · Security
tlslite-ng off-by-one error on mac checking
- GHSA ID
- GHSA-cwh5-3cw7-4286
- CVE ID
- CVE-2018-1000159
- Severity
- high
- Published
- Updated
- CVSS
- 5.9 · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS v3
- 5.9 · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CVSS v4
- 8.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
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.
CWEs
- CWE-354 · Improper Validation of Integrity Check Value
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 ↗