Bug 1687755 (CVE-2019-9686) - CVE-2019-9686 pacman: directory traversal vulnerability in lib/libalpm/dload.c
Summary: CVE-2019-9686 pacman: directory traversal vulnerability in lib/libalpm/dload.c
Alias: CVE-2019-9686
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1687756
TreeView+ depends on / blocked
Reported: 2019-03-12 10:17 UTC by Dhananjay Arunesh
Modified: 2019-09-29 15:08 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2019-06-10 10:50:30 UTC

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Description Dhananjay Arunesh 2019-03-12 10:17:18 UTC
pacman before 5.1.3 allows directory traversal when installing a remote package via a specified URL "pacman -U <url>" due to an unsanitized file name received from a Content-Disposition header. pacman renames the downloaded package file to match the name given in this header. However, pacman did not sanitize this name, which may contain slashes, before calling rename(). A malicious server (or a network MitM if downloading over HTTP) can send a Content-Disposition header to make pacman place the file anywhere in the filesystem, potentially leading to arbitrary root code execution. Notably, this bypasses pacman's package signature checking. This occurs in curl_download_internal in lib/libalpm/dload.c.

Upstream commits:

Comment 1 Dhananjay Arunesh 2019-03-12 10:17:29 UTC
Created pacman tracking bugs for this issue:

Affects: fedora-all [bug 1687756]

Comment 2 Product Security DevOps Team 2019-06-10 10:50:30 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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