Ubuntu Security Notice USN-2788-2

9th November, 2015

unzip regression

A security issue affects these releases of Ubuntu and its
derivatives:

• Ubuntu 15.10
• Ubuntu 15.04
• Ubuntu 14.04 LTS
• Ubuntu 12.04 LTS

Summary

USN-2788-1 introduced a regression in unzip.

Software description

• unzip
  – De-archiver for .zip files

Details

USN-2788-1 fixed vulnerabilities in unzip. One of the security patches
caused a regression when extracting 0-byte files. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

Gustavo Grieco discovered that unzip incorrectly handled certain password
protected archives. If a user or automated system were tricked into
processing a specially crafted zip archive, an attacker could possibly
execute arbitrary code. (CVE-2015-7696)

Gustavo Grieco discovered that unzip incorrectly handled certain malformed
archives. If a user or automated system were tricked into processing a
specially crafted zip archive, an attacker could possibly cause unzip to
hang, resulting in a denial of service. (CVE-2015-7697)

Update instructions

The problem can be corrected by updating your system to the following
package version:

Ubuntu 15.10:

unzip

6.0-17ubuntu1.2

Ubuntu 15.04:

unzip

6.0-13ubuntu3.2

Ubuntu 14.04 LTS:

unzip

6.0-9ubuntu1.5

Ubuntu 12.04 LTS:

unzip

6.0-4ubuntu2.5

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

LP: 1513293