[Japanese]

JVNDB-2017-000174

Self-Extracting Encrypted Files created by AttacheCase may insecurely load Dynamic Link Libraries

Overview

AttacheCase is an open source file encryption software provided by HiBARA Software. It can also create self-extracting encrypted files. Self-extracting encrypted files created by AttacheCase contain an issue with the DLL search path, which may lead to insecurely loading Dynamic Link Libraries (CWE-427).

Eili Masami of Tachibana Lab. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

Base Metrics: 6.8 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial

CVSS V3 Severity:
Base Metrics: 7.8 (High) [IPA Score]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High
Affected Products


HiBARA Software
  • AttacheCase ver.2.8.3.0 and earlier - CVE-2017-2271
  • AttacheCase ver.3.2.2.6 and earlier - CVE-2017-2272

Impact

Arbitrary code may be executed with the privilege of the user invoking a vulnerable self-extracting encrypted file.
Solution

[Apply Workarounds]
* When invoking a self-extracting encrypted file, make sure no unrelated files exist within the same directory. It is best to copy the installer into a newly created directory and invoke it from that directory
* Make sure no untrusted files exist within the directory where the self-extracting encrypted file is invoked.
* If you have some shared directory within your organization to place self-extracting encrypted files, make sure that this shared directory is read-only for non-administrative users
* Operate self-extracting encrypted files using a standard user (non-administrator) account. Administrator accounts should be used only when necessary.
Vendor Information

HiBARA Software
CWE (What is CWE?)

  1. No Mapping(CWE-Other) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2017-2271
  2. CVE-2017-2272
References

  1. JVN : JVN#61502349
  2. JVN : JVNTA#91240916
Revision History

[2017/07/14]
  Web page was published