Published:2007/09/05  Last Updated:2008/05/21

7-ZIP32.DLL buffer overflow vulnerability


7-ZIP32.DLL, a library for compression and decompression supporting 7z, zip, and some other format files, contains a buffer overflow vulnerability.

Products Affected

7-ZIP32.DLL Version and earlier


7-ZIP32.DLL is an open source library for compression and decompression supporting 7z, zip, and some other format files. 7-ZIP32.DLL is based on "Integrated Archiver API Specification", and called from the compression/decompression software. 7-ZIP32.DLL contains a buffer overflow vulnerability. If a user decompresses and opens a specially crafted file, a remote attacker could possibly execute arbitrary code with the privilege of the user.


Arbitrary code could be executed with the privilege of a user who opened a specially crafted file.


Apply the latest updates provided by the developer.

For more information, refer to the developer's website.

Vendor Status

Vendor Status Last Update Vendor Notes
Akky Vulnerable 2007/09/05


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2007.09.05

Measures Conditions Severity
Access Required Routed - can be attacked over the Internet using packets
  • High
Authentication None - anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required Simple - the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Medium
Exploit Complexity Low-Medium - some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Medium-High

Description of each analysis measures


Yuji Ukai of Fourteenforty Research Institute, Inc. reported this vulnerability to IPA.
JPCERT/CC coordinated with the vendors under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2007-4725
JVN iPedia JVNDB-2007-000645

Update History