CVE-2018-1000159

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.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895728&gt;