libarchive up to 3.2.0 CPIO Archive archive_read_support_format_cpio.c archive_read_format_cpio_read_header input validation

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CTI Interest Score
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A vulnerability classified as critical was found in libarchive up to 3.2.0 (File Compression Software). Affected by this vulnerability is the function archive_read_format_cpio_read_header of the file archive_read_support_format_cpio.c of the component CPIO Archive Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

The archive_read_format_cpio_read_header function in archive_read_support_format_cpio.c in libarchive before 3.2.1 allows remote attackers to cause a denial of service (application crash) via a CPIO archive with a large symlink.

The weakness was shared 09/21/2016 (Website). It is possible to read the advisory at This vulnerability is known as CVE-2016-4809 since 05/16/2016. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 92312 (Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : libarchive vulnerabilities (USN-3033-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169015 (SUSE Enterprise Linux Security Update for bsdtar (SUSE-SU-2016:1939-1)).

Upgrading to version 3.2.1 eliminates this vulnerability. A possible mitigation has been published even before and not after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (92312).






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
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Class: Input validation

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 92312
Nessus Name: Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : libarchive vulnerabilities (USN-3033-1)
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OpenVAS ID: 15621
OpenVAS Name: Amazon Linux Local Check: alas-2016-743
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Recommended: Upgrade
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Upgrade: libarchive 3.2.1


05/12/2016 🔍
05/16/2016 +4 days 🔍
07/14/2016 +59 days 🔍
07/15/2016 +1 days 🔍
09/21/2016 +68 days 🔍
09/21/2016 +0 days 🔍
09/22/2016 +1 days 🔍
09/19/2022 +2188 days 🔍


Advisory: 705
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-4809 (🔍)

SecurityFocus: 91813 - libarchive CVE-2016-4809 Denial Of Service Vulnerability


Created: 09/22/2016 09:22 AM
Updated: 09/19/2022 02:20 PM
Changes: 09/22/2016 09:22 AM (68), 04/22/2019 06:06 PM (13), 09/19/2022 02:19 PM (5), 09/19/2022 02:20 PM (1)
Complete: 🔍
Cache ID: 44:075:40


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