CVE-2018-1000159
April 18, 2018
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 Packages
tlslite-ng (PYTHON):
Affected version(s) >=0.5.0-beta1 <0.7.4Fix Suggestion:
Update to version 0.7.4tlslite-ng (PYTHON):
Affected version(s) >=0.5.0-beta1 <0.7.4Fix Suggestion:
Update to version 0.7.4tlslite-ng (PYTHON):
Affected version(s) >=0.5.0-beta1 <0.7.4Fix Suggestion:
Update to version 0.7.4tlslite-ng (PYTHON):
Affected version(s) >=0.5.0-beta1 <0.7.4Fix Suggestion:
Update to version 0.7.4Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
CVSS v2
Base Score:
4.3
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Weakness Type (CWE)
Improper Validation of Integrity Check Value
EPSS
Base Score:
0.16
