CVE-2020-13962 Denial of service in n/a
Mishandling of OpenSSL error queue in Qt allows attackers to cause denial of service by disconnecting unrelated TLS sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-13962?
CVE-2020-13962 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 8 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)
Which versions are affected by CVE-2020-13962?
It affects 4 products.
Linux distribution packages (4)
libqt5-qtbase SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 5.12.7-4.3.1 |
libqt5-qtbase SUSE:Linux Enterprise Module for Desktop Applications 15 SP2 | All versions | 5.12.7-4.3.1 |
libqt5-qtbase openSUSE:Leap 15.2 | All versions | 5.12.7-lp152.3.3.1 |
libqt5-qtbase openSUSE:Tumbleweed | All versions | 5.15.2+kde268-2.1 |
Products include Fedoraproject Fedora, Mumble Mumble, Opensuse Leap, Qt Qt.
How do I fix CVE-2020-13962?
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-2020-13962 being exploited?
There is no known exploitation of CVE-2020-13962 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as AZL-6835, DEBIAN-CVE-2020-13962, GHSA-c4xh-w73g-qgf6, MGASA-2021-0200, SUSE-SU-2020:2357-1, UBUNTU-CVE-2020-13962 and 2 more.