Avast vulnerable to directory traversal


Avast contains an issue in processing archive files, which may result in a directory traversal (CWE-22) vulnerability.
When an archive file such as zip is detected as containing a virus and the included virus file is being moved or deleted, the operation is done to the file path inside the archive file.

Ryohei Koike of Sakura Information Systems 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 V2 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

AVAST Software s.r.o.
  • avast Antivirus with Virus Definition ID prior to 150918-0


When an archive such as zip is scanned and a file in the archive is detected to be a virus, and either the move or delete option is selected, the operation is performed against the file path specified within the archive file.

[Update the Virus Definition]
Update the Virus Definition file to the latest version according to the information provided by the developer.

According to the developer, the vulnerable code is included in Virus Definition and ID 150918-0 addressed the issue.
Vendor Information

AVAST Software s.r.o.
CWE (What is CWE?)

  1. Path Traversal(CWE-22) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2015-5662

  1. JVN : JVN#25576608
  2. National Vulnerability Database (NVD) : CVE-2015-5662
Revision History

  • [2015/10/16]
      Web page was published
      References : Content was added