UBUNTU-CVE-2020-13757

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    UBUNTU-CVE-2020-13757

    Published: 1 Jun 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-13757

    Summary:

    Details: Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).

    References: https://ubuntu.com/security/CVE-2020-13757, https://github.com/sybrenstuvel/python-rsa/issues/146, https://ubuntu.com/security/notices/USN-4478-1, https://ubuntu.com/security/notices/USN-4478-2, https://www.cve.org/CVERecord?id=CVE-2020-13757

    Affected packages

    Package

    Name: python-rsa

    Purl: pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.1.2-1ubuntu0.1+esm1

    Affected versions

    3.1.2-1
    3.1.2-1ubuntu0.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2020-13757 | CVE-DB