Access Restriction Bypass Affecting click package, versions <0.4.21.1ubuntu0.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1404-CLICK-262726
- published13 Feb 2017
- disclosed13 Feb 2017
Introduced: 13 Feb 2017
CVE-2015-8768 (opens in a new tab)How to fix?
Upgrade Ubuntu:14.04 click to version 0.4.21.1ubuntu0.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream click package and not the click package as distributed by Ubuntu.
See How to fix? for Ubuntu:14.04 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2015-8768
- http://bazaar.launchpad.net/~click-hackers/click/devel/revision/587
- 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
- http://ubuntu.com/usn/usn-2771-1
- http://www.openwall.com/lists/oss-security/2016/01/12/8
- http://www.securityfocus.com/bid/96386