YoruFukurou (NightOwl) vulnerable to denial-of-service (DoS)


YoruFukurou (NightOwl) is a Twitter client application for OS X. YoruFukurou uses OS X API CTFramesetter to render text contents.
CTFramesetter has a problem in processing a certain emoji character sequence, which may cause YoruFukurou to crash.

This problem was verified on OS X v10.9 (Mavericks). The developer of YoruFukurou states that the problem does not exist on OS X v10.11 (El Capitan).

Ryo Ichikawa of Tokyo University of Agriculture and Technology 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 4.3 (Medium) [IPA Score]
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low
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

  • YoruFukurou (NightOwl) version 2.84 and earlier


YoruFukurou may crash when rendering a certain emoji character sequence.

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

CWE (What is CWE?)

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

  1. CVE-2016-4852

  1. JVN : JVN#94816361
  2. National Vulnerability Database (NVD) : CVE-2016-4852
Revision History

  • [2016/08/24]
      Web page was published
      References : Content was added