Vulnerability-Lookup

JVNDB-2015-000119

Vulnerability from jvndb - Published: 2015-08-27 06:03 - Updated:2015-09-02 08:57

Severity

N/A (UNKNOWN) - -

Summary

File Encryption Software "ED" where encrypted data may be easier to decipher when files of small size are encrypted

Details

File encyption software "ED" contains an issue when files of small size are encyrpted, they may become easier to decipher in comparison to when files of a larger size are encrypted. When encrypting small files that are smaller than the block size (128 bits), file encryption software "ED" encrypts such files with "a stream cipher combining ECB mode of the selected encryption algorithm on key generation". This results in deciphering the resulting encrypted data to become relatively easy. For more details on this specification, pelase refer to the documentation (http://type74.org/edman5-1.php) provided by the developer. Yutaka Sawada reported this vulnerability to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

References

Type

URL

	JVN	http://jvn.jp/en/jp/JVN91474878/index.html
	CVE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2987
	NVD	https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2987
	No Mapping(CWE-DesignError)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

Type74.org

File encryption software "ED"

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2015/JVNDB-2015-000119.html",
  "dc:date": "2015-09-02T17:57+09:00",
  "dcterms:issued": "2015-08-27T15:03+09:00",
  "dcterms:modified": "2015-09-02T17:57+09:00",
  "description": "File encyption software \"ED\" contains an issue when files of small size are encyrpted, they may become easier to decipher in comparison to when files of a larger size are encrypted.\r\n\r\nWhen encrypting small files that are smaller than the block size (128 bits), file encryption software \"ED\" encrypts such files with \"a stream cipher combining ECB mode of the selected encryption algorithm on key generation\". This results in deciphering the resulting encrypted data to become relatively easy. For more details on this specification, pelase refer to the documentation (http://type74.org/edman5-1.php) provided by the developer.\r\n\r\nYutaka Sawada reported this vulnerability to IPA.\r\nJPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.",
  "link": "https://jvndb.jvn.jp/en/contents/2015/JVNDB-2015-000119.html",
  "sec:cpe": {
    "#text": "cpe:/a:type74:ed",
    "@product": "File encryption software \"ED\"",
    "@vendor": "Type74.org",
    "@version": "2.2"
  },
  "sec:cvss": {
    "@score": "2.6",
    "@severity": "Low",
    "@type": "Base",
    "@vector": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
    "@version": "2.0"
  },
  "sec:identifier": "JVNDB-2015-000119",
  "sec:references": [
    {
      "#text": "http://jvn.jp/en/jp/JVN91474878/index.html",
      "@id": "JVN#91474878",
      "@source": "JVN"
    },
    {
      "#text": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2987",
      "@id": "CVE-2015-2987",
      "@source": "CVE"
    },
    {
      "#text": "https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2987",
      "@id": "CVE-2015-2987",
      "@source": "NVD"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-DesignError",
      "@title": "No Mapping(CWE-DesignError)"
    }
  ],
  "title": "File Encryption Software \"ED\" where encrypted data may be easier to decipher when files of small size are encrypted"
}

CVE-2015-2987 (GCVE-0-2015-2987)

Vulnerability from cvelistv5 – Published: 2015-08-28 14:00 – Updated: 2024-08-06 05:32

Summary

Type74 ED before 4.0 misuses 128-bit ECB encryption for small files, which makes it easier for attackers to obtain plaintext data via differential cryptanalysis of a file with an original length smaller than 128 bits.

Severity

No CVSS data available.

CWE

Assigner

jpcert CNA under the jpcert root

CNA scorecard C 64/100 over 191 records in the last 180 days details

References

4 references

URL	Tags
http://type74org.blog14.fc2.com/blog-entry-1384.html	x_refsource_CONFIRM
http://type74.org/edman5-1.php	x_refsource_CONFIRM
http://jvndb.jvn.jp/jvndb/JVNDB-2015-000119	third-party-advisoryx_refsource_JVNDB
http://jvn.jp/en/jp/JVN91474878/index.html	third-party-advisoryx_refsource_JVN

Date Public

2015-08-27 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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