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CVE-2019-9686

8.8 · HIGH

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.

Published Mar 11, 2019CWE-22EPSS 3.38%

Overview

CVE-2019-9686 is a high-severity vulnerability. It was published on March 11, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.archlinux.org/pacman.git/commit/?h=release/5.1.x&id=1bf767234363f7ad5933af3f7ce267c123017bdeRefgit.archlinux.org/pacman.git/commit/?id=9702703633bec2c007730006de2aeec8587dfc84Refgit.archlinux.org/pacman.git/commit/?id=d197d8ab82cf10650487518fb968067897a12775Refgit.archlinux.org/pacman.git/commit/?h=release/5.1.x&id=1bf767234363f7ad5933af3f7ce267c123017bdeRefgit.archlinux.org/pacman.git/commit/?id=9702703633bec2c007730006de2aeec8587dfc84Refgit.archlinux.org/pacman.git/commit/?id=d197d8ab82cf10650487518fb968067897a12775

How CyberStrike helps

Frequently asked questions

What is CVE-2019-9686?

CVE-2019-9686 is a high-severity vulnerability. It was published on March 11, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2019-9686?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-9686?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-9686?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-9686 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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