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    ArchLinux: 202006-2: gnutls: man-in-the-middle

    Date
    127
    Posted By
    The package gnutls before version 3.6.14-1 is vulnerable to man-in-the- middle.
    Arch Linux Security Advisory ASA-202006-2
    =========================================
    
    Severity: High
    Date    : 2020-06-06
    CVE-ID  : CVE-2020-13777
    Package : gnutls
    Type    : man-in-the-middle
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1177
    
    Summary
    =======
    
    The package gnutls before version 3.6.14-1 is vulnerable to man-in-the-
    middle.
    
    Resolution
    ==========
    
    Upgrade to 3.6.14-1.
    
    # pacman -Syu "gnutls>=3.6.14-1"
    
    The problem has been fixed upstream in version 3.6.14.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a
    session ticket (a loss of confidentiality in TLS 1.2, and an
    authentication bypass in TLS 1.3). The earliest affected version is
    3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until
    the first key rotation, the TLS server always uses wrong data in place
    of an encryption key derived from an application.
    
    Impact
    ======
    
    A remote attacker can man-in-the-middle a connection to bypass
    authentication in TLS 1.3, and recover previous conversations in TLS
    1.2.
    
    References
    ==========
    
    https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
    https://gitlab.com/gnutls/gnutls/-/issues/1011
    https://gitlab.com/gnutls/gnutls/-/commit/c2646aeee94e71cb15c90a3147cf3b5b0ca158ca?merge_request_iid=1275
    https://security.archlinux.org/CVE-2020-13777
    

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