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    Gentoo: GLSA-202012-21: Mozilla Network Security Service (NSS): Denial of service

    Date 23 Dec 2020
    482
    Posted By LinuxSecurity Advisories
    A vulnerability in NSS might allow remote attackers to cause a Denial of Service condition.
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    Gentoo Linux Security Advisory                           GLSA 202012-21
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                                                https://security.gentoo.org/
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      Severity: Low
         Title: Mozilla Network Security Service (NSS): Denial of service
          Date: December 23, 2020
          Bugs: #750254
            ID: 202012-21
    
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    Synopsis
    ========
    
    A vulnerability in NSS might allow remote attackers to cause a Denial
    of Service condition.
    
    Background
    ==========
    
    The Mozilla Network Security Service (NSS) is a library implementing
    security features like SSL v.2/v.3, TLS, PKCS #5, PKCS #7, PKCS #11,
    PKCS #12, S/MIME and X.509 certificates.
    
    Affected packages
    =================
    
         -------------------------------------------------------------------
          Package              /     Vulnerable     /            Unaffected
         -------------------------------------------------------------------
       1  dev-libs/nss                  < 3.58                     >= 3.58
    
    Description
    ===========
    
    A flaw was found in the way Mozilla Network Security Service (NSS)
    handled CCS (ChangeCipherSpec) messages in TLS 1.3.
    
    Impact
    ======
    
    A remote attacker could send multiple crafted CSS messages in row after
    ClientHello message to a server application linked against NSS library,
    possibly resulting in a Denial of Service condition.
    
    Workaround
    ==========
    
    Disable TLS 1.3 protocol.
    
    Resolution
    ==========
    
    All NSS users should upgrade to the latest version:
    
       # emerge --sync
       # emerge --ask --oneshot --verbose ">=dev-libs/nss-3.58"
    
    References
    ==========
    
    [ 1 ] CVE-2020-25648
           https://nvd.nist.gov/vuln/detail/CVE-2020-25648
    
    Availability
    ============
    
    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:
    
      https://security.gentoo.org/glsa/202012-21
    
    Concerns?
    =========
    
    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users' machines is of utmost
    importance to us. Any security concerns should be addressed to
    This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at
    https://bugs.gentoo.org.
    
    License
    =======
    
    Copyright 2020 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).
    
    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.
    
    https://creativecommons.org/licenses/by-sa/2.5
    
    

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