[Japanese]

JVNDB-2018-000116

Mail app for iOS vulnerable to denial-of-service (DoS)

Overview

Mail app for iOS provided by Apple contains a denial-of-service (DoS) vulnerability due to an issue in the handling of a maliciously crafted S/MIME signed message.

Yukinobu Nagayasu of LAC Co., Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 7.5 (High) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High
CVSS V2 Severity:
Base Metrics 5.0 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Low
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Partial
Affected Products


Apple Inc.
  • iOS Mail app

Impact

Mail app may continuously crash when a maliciously crafted S/MIME signed message is listed on it.
Solution

[Update iOS]
Update iOS to the latest version according to the information provided by the developer.
Vendor Information

Apple Inc.
CWE (What is CWE?)

  1. Improper Input Validation(CWE-20) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2018-4400
References

  1. JVN : JVN#96551318
  2. National Vulnerability Database (NVD) : CVE-2018-4400
Revision History

  • [2018/11/02]
      Web page was published

Date Public2018/11/02
Date First Published2018/11/02
Date Last Updated2018/11/02