CVE-2018-1000159

Advisory

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.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://github.com/advisories/GHSA-cwh5-3cw7-4286
• https://nvd.nist.gov/vuln/detail/CVE-2018-1000159
• https://github.com/tomato42/tlslite-ng/pull/234
• https://github.com/tomato42/tlslite-ng
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000159