CVE-2015-8768 Information

Description

click/install.py in click does not require files in package filesystem tarballs to start with ./ (dot slash) which allows remote attackers to install an alternate security policy and gain privileges via a crafted package as demonstrated by the test.mmrow app for Ubuntu phone.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

http://bazaar.launchpad.net/~click-hackers/click/devel/revision/587 http://ubuntu.com/usn/usn-2771-1 http://www.openwall.com/lists/oss-security/2016/01/12/8 http://www.securityfocus.com/bid/96386 https://bugs.launchpad.net/ubuntu/+source/click/+bug/1506467 https://code.launchpad.net/~cjwatson/click/audit-missing-dot-slash/+merge/274554 https://insights.ubuntu.com/2015/10/15/update-on-ubuntu-phone-security-issue/ https://plus.google.com/+SzymonWaliczek/posts/3jbG2uiAniF

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8