CVE-2020-1747 Improper Input Validation in PyYAML
Attackers can execute arbitrary code by providing malicious YAML files to applications using PyYAML's full_load or FullLoader.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-1747?
CVE-2020-1747 is a critical code injection vulnerability in Fedoraproject Fedora, published on 24 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was discovered in the PyYAML library in versions before 5.3.1, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/new constructor.
Weakness: CWE-20
Which versions are affected by CVE-2020-1747?
3 open source packages ship an affected version, including pyyaml. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
pyyaml PyPI | From 5.1 | 5.3.1 |
pyyaml PyPI | From 5.1b7 | 5.3.1 |
pyyaml PyPI | From 5.1b7 | 5.3.1 |
Linux distribution packages (26)
python-PyYAML SUSE:Enterprise Storage 5 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:HPE Helion OpenStack 8 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise High Availability Extension 12 SP1 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise High Availability Extension 12 SP2 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Module for Advanced Systems Management 12 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 5.1.2-6.6.1 |
python-PyYAML SUSE:Linux Enterprise Module for Containers 12 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Module for Public Cloud 12 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Module for Python 2 15 SP1 | All versions | 5.1.2-6.6.1 |
python-PyYAML SUSE:Linux Enterprise Point of Sale 12 SP2 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server 12 SP3-BCL | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server 12 SP3-LTSS | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server 12 SP4 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server 12 SP5 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server for SAP Applications 12 SP3 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server for SAP Applications 12 SP4 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Manager Client Tools 12 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Manager Proxy 3.2 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:Manager Server 3.2 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:OpenStack Cloud 6-LTSS | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:OpenStack Cloud 7 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:OpenStack Cloud 8 | All versions | 5.1.2-26.12.1 |
python-PyYAML SUSE:OpenStack Cloud Crowbar 8 | All versions | 5.1.2-26.12.1 |
python-PyYAML openSUSE:Leap 15.1 | All versions | 5.1.2-lp151.2.13.1 |
python-PyYAML openSUSE:Leap 15.1 | All versions | 5.1.2-lp151.2.6.1 |
Products include Fedoraproject Fedora, Opensuse Leap, Oracle Communications Cloud Native Core Network Function Cloud Native Environment, Pyyaml Pyyaml.
How do I fix CVE-2020-1747?
Upgrade pyyaml to 5.3.1 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-1747 being exploited?
There is no known exploitation of CVE-2020-1747 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2020-1747, AZL-31783, DEBIAN-CVE-2020-1747, GHSA-6757-jp84-gxfx, MGASA-2020-0155, PYSEC-2020-96 and 4 more.