[ASA-202102-7] nextcloud: directory traversal
Remi Gacogne
rgacogne at archlinux.org
Fri Feb 12 07:03:15 UTC 2021
Arch Linux Security Advisory ASA-202102-7
=========================================
Severity: Medium
Date : 2021-02-06
CVE-ID : CVE-2020-36193
Package : nextcloud
Type : directory traversal
Remote : Yes
Link : https://security.archlinux.org/AVG-1464
Summary
=======
The package nextcloud before version 20.0.6-1 is vulnerable to
directory traversal.
Resolution
==========
Upgrade to 20.0.6-1.
# pacman -Syu "nextcloud>=20.0.6-1"
The problem has been fixed upstream in version 20.0.6.
Workaround
==========
None.
Description
===========
Tar.php in Archive_Tar through 1.4.11 allows write operations with
Directory Traversal due to inadequate checking of symbolic links, a
related issue to CVE-2020-28948.
Impact
======
A remote attacker might be able to write files in arbitrary file system
locations by uploading a crafted archive file that leads to directory
traversal.
References
==========
https://pear.php.net/bugs/bug.php?id=27008
https://github.com/pear/Archive_Tar/commit/cde460582ff389404b5b3ccb59374e9b389de916
https://github.com/nextcloud/3rdparty/commit/87062377878054f58d62f6b1853ed61664404de6
https://github.com/nextcloud/3rdparty/commit/4f95d388e0888c130316c2a21f160d553219ea48
https://security.archlinux.org/CVE-2020-36193
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