Bug 1811684 (CVE-2020-10174) - CVE-2020-10174 timeshift: Arbitrary local code execution due to unsafe usage of temporary directory in /tmp/timeshift
Summary: CVE-2020-10174 timeshift: Arbitrary local code execution due to unsafe usage ...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-10174
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1811685 1811687
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-03-09 14:36 UTC by Pedro Sampaio
Modified: 2020-03-09 16:31 UTC (History)
1 user (show)

Fixed In Version:
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Clone Of:
Environment:
Last Closed: 2020-03-09 16:31:59 UTC


Attachments (Terms of Use)

Description Pedro Sampaio 2020-03-09 14:36:42 UTC
init_tmp in TeeJee.FileSystem.vala in Timeshift before 20.03 unsafely reuses a preexisting temporary directory in the predictable location /tmp/timeshift. It follows symlinks in this location or uses directories owned by unprivileged users. Because Timeshift also executes scripts under this location, an attacker can attempt to win a race condition to replace scripts created by Timeshift with attacker-controlled scripts. Upon success, an attacker-controlled script is executed with full root privileges. This logic is practically always triggered when Timeshift runs regardless of the command-line arguments used. 

References:

https://www.openwall.com/lists/oss-security/2020/03/06/3
https://github.com/teejee2008/timeshift/commit/335b3d5398079278b8f7094c77bfd148b315b462
https://github.com/teejee2008/timeshift/releases/tag/v20.03

Comment 1 Pedro Sampaio 2020-03-09 14:37:34 UTC
Created timeshift tracking bugs for this issue:

Affects: epel-7 [bug 1811687]
Affects: fedora-all [bug 1811685]

Comment 2 Product Security DevOps Team 2020-03-09 16:31:59 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


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