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    ArchLinux: 202007-6: libjcat: insufficient validation

    Date 31 Jul 2020
    245
    Posted By LinuxSecurity Advisories
    The package libjcat before version 0.1.3-1 is vulnerable to insufficient validation.
    Arch Linux Security Advisory ASA-202007-6
    =========================================
    
    Severity: High
    Date    : 2020-07-31
    CVE-ID  : CVE-2020-10759
    Package : libjcat
    Type    : insufficient validation
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1185
    
    Summary
    =======
    
    The package libjcat before version 0.1.3-1 is vulnerable to
    insufficient validation.
    
    Resolution
    ==========
    
    Upgrade to 0.1.3-1.
    
    # pacman -Syu "libjcat>=0.1.3-1"
    
    The problem has been fixed upstream in version 0.1.3.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A PGP signature verification bypass has been found in fwupd prior to
    1.4.0, and in libjcat <= 0.1.2. The issue is that if a detached
    signature is actually a PGP message, gpgme_op_verify() returns the
    rather perplexing GPG_ERR_NO_ERROR, and then gpgme_op_verify_result()
    builds an empty list.
    
    Impact
    ======
    
    A local attacker could pass signature validation with a crafted
    message.
    
    References
    ==========
    
    https://github.com/justinsteven/advisories/blob/master/2020_fwupd_dangling_s3_bucket_and_CVE-2020-10759_signature_verification_bypass.md
    https://github.com/hughsie/libjcat/commit/839b89f
    https://security.archlinux.org/CVE-2020-10759
    

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