CVE-2020-12049 Denial of service in n/a

What is CVE-2020-12049?

CVE-2020-12049 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 8 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in dbus >= 1.3.0 before 1.12.18. The DBusServer in libdbus, as used in dbus-daemon, leaks file descriptors when a message exceeds the per-message file descriptor limit. A local attacker with access to the D-Bus system bus or another system service's private AF_UNIX socket could use this to make the system service reach its file descriptor limit, denying service to subsequent D-Bus clients.

Weakness: CWE-404

Which versions are affected by CVE-2020-12049?

It affects 2 products.

Products include Canonical Ubuntu Linux, Freedesktop Dbus.

How do I fix CVE-2020-12049?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2020-12049 being exploited?

There is no known exploitation of CVE-2020-12049 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as ALPINE-CVE-2020-12049, DEBIAN-CVE-2020-12049, DLA-2235-1, JLSEC-2025-18, MGASA-2020-0262, RHSA-2020:2894 and 10 more.