#VU32265 Input validation error in libarchive - CVE-2016-4809

Vulnerability identifier: #VU32265

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-4809

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libarchive
Client/Desktop applications / Software for archiving

Vendor: libarchive

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libarchive: 3.2.0

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External links
https://rhn.redhat.com/errata/RHSA-2016-1844.html
https://rhn.redhat.com/errata/RHSA-2016-1850.html
https://www.debian.org/security/2016/dsa-3657
https://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
https://www.securityfocus.com/bid/91813
https://bugzilla.redhat.com/show_bug.cgi?id=1347084
https://github.com/libarchive/libarchive/commit/fd7e0c02
https://github.com/libarchive/libarchive/issues/705
https://security.gentoo.org/glsa/201701-03

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.