UBUNTU-CVE-2020-28361

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    UBUNTU-CVE-2020-28361

    Published: 18 Nov 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-28361
    Aliases:
    USN-7416-1

    Summary:

    Details: Kamailio before 5.4.0, as used in Sip Express Router (SER) in Sippy Softswitch 4.5 through 5.2 and other products, allows a bypass of a header-removal protection mechanism via whitespace characters. This occurs in the remove_hf function in the Kamailio textops module. Particular use of remove_hf in Sippy Softswitch may allow skilled attacker having a valid credential in the system to disrupt internal call start/duration accounting mechanisms leading potentially to a loss of revenue.

    References: https://ubuntu.com/security/CVE-2020-28361, https://packetstormsecurity.com/files/159030/Kamailio-5.4.0-Header-Smuggling.html, https://support.sippysoft.com/support/discussions/topics/3000179616, https://www.cve.org/CVERecord?id=CVE-2020-28361, https://ubuntu.com/security/notices/USN-7416-1

    Affected packages

    Package

    Name: kamailio

    Purl: pkg:deb/ubuntu/[email protected]+esm2?arch=source&distro=esm-apps/xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.3.1-2ubuntu1
    4.3.4-1.1ubuntu1
    4.3.4-1.1ubuntu2
    4.3.4-1.1ubuntu2.1
    4.3.4-1.1ubuntu2.1+esm1
    4.3.4-1.1ubuntu2.1+esm2

    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