ubuntu-cve-2018-1000159
Vulnerability from osv_ubuntu
Published
2018-04-18 19:29
Modified
2025-10-24 04:47
Summary
Details

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.

Severity
5.9 (Medium)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "python-tlslite-ng",
            "binary_version": "0.5.1-1"
          },
          {
            "binary_name": "python3-tlslite-ng",
            "binary_version": "0.5.1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "tlslite-ng",
        "purl": "pkg:deb/ubuntu/tlslite-ng@0.5.1-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.5.1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2018-1000159",
  "modified": "2025-10-24T04:47:20Z",
  "published": "2018-04-18T19:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-1000159"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tomato42/tlslite-ng/pull/234"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tomato42/tlslite-ng/pull/234/commits/3674815d1b0f7484454995e2737a352e0a6a93d8"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tomato42/tlslite-ng/pull/235"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/tomato42/tlslite-ng/pull/235/commits/e5e9145558f4c1a81071c61c947aa55a52542585"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-1000159"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-1000159"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.