Use of a broken or risky cryptographic algorithm in python-rsa - CVE-2020-13757

Vulnerability identifier: #VU28793

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-13757

CWE-ID: CWE-327

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to gain access to sensitive information on the target system.

The vulnerability exists due to the affected software does not detect ciphertext modification during decryption (prepended "0" bytes) in PKCS1_v1_5. A remote attacker gain access to sensitive information on the system.

python-rsa
Amazon Linux AMI
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE CaaS Platform
SUSE Enterprise Storage
Fedora
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
HPE Helion Openstack
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Server
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Basesystem
openEuler
python-rsa (Red Hat package)
jenkins-2-plugins (Red Hat package)
SUSE Linux Enterprise Module for Packagehub Subpackages
python-rsa (Ubuntu package)
python3-rsa (Ubuntu package)
python-rsa
python3-rsa
python2-rsa

Install updates from vendor's website.

python-rsa - update to 4.1
python-rsa (Red Hat package) - update to 4.5-1.el7
jenkins-2-plugins (Red Hat package) - update to 4.5.1596698303-1.el7
python-rsa (Ubuntu package) - update to 3.1.2-1ubuntu0.1+esm1
python3-rsa (Ubuntu package) - update to 3.1.2-1ubuntu0.1+esm1
python-rsa - addressed in versions 3.1.4-12.16.1, 3.4.2-3.3.1, 3.4.2-4.4.1
python-rsa - addressed in versions 3.4.2-1.el6, 3.4.2-1.el7, 3.4.2-15.el8, 3.4.2-15.fc31, 3.4.2-15.fc32
python3-rsa - update to 3.4.2-3.4.1
python2-rsa - update to 3.4.2-3.4.1
python-rsa - update to 3.4.2-12
python2-rsa - update to 3.4.2-12
python3-rsa - update to 3.4.2-12

• https://github.com/sybrenstuvel/python-rsa/issues/146
• https://github.com/sybrenstuvel/python-rsa/commit/93af6f2f89a9bf28361e67716c4240e691520f30

• Use of a broken or risky cryptographic algorithm in python-rsa
• Red Hat OpenShift Container Platform 4 update for jenkins-2-plugins and python-rsa
• Amazon Linux AMI update for python-rsa
• SUSE update for python-rsa
• SUSE update for python-rsa
• SUSE update for python-rsa
• SUSE update for python-rsa
• openEuler 20.03 LTS update for python-rsa
• Ubuntu update for python-rsa
• Fedora EPEL 8 update for python-rsa
• Fedora EPEL 7 update for python-rsa
• Fedora 31 update for python-rsa
• Fedora EPEL 6 update for python-rsa
• Fedora 32 update for python-rsa