What is CVE-2018-1000159?

CVE-2018-1000159 is a medium-severity vulnerability in Tlslite-Ng Project, classified under Improper Validation of Integrity Check Value. CVSS score: 5.9/10. Published 2018-04-18.

How severe is CVE-2018-1000159?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2018-1000159 known to be exploited?

11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Tlslite-Ng Project

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.

EPSS: 0.008 (52.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Tlslite-ng_project Tlslite-ng
N/a — versions n/a

Weakness classification (CWE)

CWE-354 — Improper Validation of Integrity Check Value

Public proof-of-concept exploits

References

cve@mitre.org (Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2018-1000159?: CVE-2018-1000159 is a medium-severity vulnerability in Tlslite-Ng Project, classified under Improper Validation of Integrity Check Value. CVSS score: 5.9/10. Published 2018-04-18.
How severe is CVE-2018-1000159?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2018-1000159 known to be exploited?: 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.