What’s Vulnerable › Vulnerabilities

CVE-2019-1000020

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-02-04 · updated 2026-06-17
• Weakness: CWE-835

Description

libarchive version commit 5a98dcf8a86364b3c2c469c85b93647dfb139961 onwards (version v2.8.0 onwards) contains a CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in ISO9660 parser, archive_read_support_format_iso9660.c, read_CE()/parse_rockridge() that can result in DoS by infinite loop. This attack appears to be exploitable via the victim opening a specially crafted ISO9660 file.

Affected products

• Canonical Ubuntu Linux: 14.04, 16.04, 18.04, 18.10
• Debian Linux: 8.0
• Fedoraproject Fedora: 29
• libarchive: from 2.8.0 before 3.4.0 — fixed in 3.4.0
• openSUSE Leap: 15.0
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Workstation: 7.0

How to fix

Upgrade to a fixed version: libarchive 3.4.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00055.html
• http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00015.html
• https://access.redhat.com/errata/RHSA-2019:2298
• https://access.redhat.com/errata/RHSA-2019:3698
• https://github.com/libarchive/libarchive/pull/1120
• https://github.com/libarchive/libarchive/pull/1120/commits/8312eaa576014cd9b965012af51bc1f967b12423
• https://lists.debian.org/debian-lts-announce/2019/02/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBOCC2M6YGPZA6US43YK4INPSJZZHRTG/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZVXA7PHINVT6DFF6PRLTDTVTXKDLVHNF/
• https://usn.ubuntu.com/3884-1/
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00055.html

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