Security readout for executives and security teams
Plain-English summary
CVE-2018-1000159 affects tlslite-ng 0.7.3 and earlier. A flaw in TLS message integrity validation may let a network man-in-the-middle alter encrypted TLS ciphertext without detection by the receiving tlslite-ng implementation. No CVSS score or active exploitation evidence is provided.
Executive priority
Treat this as a targeted dependency risk, not a broad internet-wide emergency. Prioritize validation where tlslite-ng is used in security-sensitive network paths because the described impact undermines TLS integrity under man-in-the-middle conditions.
Technical view
The issue is CWE-354 in tlslite/utils/constanttime.py, specifically ct_check_cbc_mac_and_pad(). The CVE describes incorrect handling around end_pos calculation, affecting CBC MAC-and-padding validation. The reported fix landed after commit 3674815d1b0f7484454995e2737a352e0a6a93d8.
Likely exposure
Exposure is limited to applications or services that directly or transitively use tlslite-ng 0.7.3 or earlier for TLS handling. The supplied affected metadata is incomplete, so confirm actual dependency usage in builds, containers, and packaged deployments.
Exploitation context
The CVE states exploitation appears possible by a man-in-the-middle on a network connection. The source bundle does not show CISA KEV listing, active exploitation, public weaponization, or confirmed real-world incidents.
Researcher notes
Key gaps are missing CVSS, incomplete affected-product metadata, and no named fixed release in the bundle. Analysis should focus on proving whether tlslite-ng is present and whether the deployed version includes the post-3674815d fix.
Mitigation direction
- Inventory applications and packages for tlslite-ng 0.7.3 or earlier.
- Upgrade to a release containing the fix after the cited upstream commit.
- Review upstream PR #234 and vendor guidance for exact fixed release details.
- Prioritize systems where tlslite-ng protects sensitive or untrusted network traffic.
- Retire or isolate affected services that cannot be updated promptly.
Validation and detection
- Check dependency manifests, lockfiles, containers, and runtime environments for tlslite-ng versions.
- Confirm deployed code no longer contains the vulnerable ct_check_cbc_mac_and_pad() implementation.
- Verify production artifacts include the upstream fix, not only source branches.
- Document any remaining tlslite-ng use and compensating controls.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-1000159 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/tomato42/tlslite-ng/pull/234CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.