Debian: DSA-4689-1: bind9 security update

    Date 19 May 2020
    184
    Posted By LinuxSecurity Advisories
    Several vulnerabilities were discovered in BIND, a DNS server implementation. CVE-2019-6477
    
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    Debian Security Advisory DSA-4689-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    May 19, 2020                          https://www.debian.org/security/faq
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    Package        : bind9
    CVE ID         : CVE-2019-6477 CVE-2020-8616 CVE-2020-8617
    Debian Bug     : 945171
    
    Several vulnerabilities were discovered in BIND, a DNS server
    implementation.
    
    CVE-2019-6477
    
        It was discovered that TCP-pipelined queries can bypass tcp-client
        limits resulting in denial of service.
    
    CVE-2020-8616
    
        It was discovered that BIND does not sufficiently limit the number
        of fetches performed when processing referrals. An attacker can take
        advantage of this flaw to cause a denial of service (performance
        degradation) or use the recursing server in a reflection attack with
        a high amplification factor.
    
    CVE-2020-8617
    
        It was discovered that a logic error in the code which checks TSIG
        validity can be used to trigger an assertion failure, resulting in
        denial of service.
    
    For the oldstable distribution (stretch), these problems have been fixed
    in version 1:9.10.3.dfsg.P4-12.3+deb9u6.
    
    For the stable distribution (buster), these problems have been fixed in
    version 1:9.11.5.P4+dfsg-5.1+deb10u1.
    
    We recommend that you upgrade your bind9 packages.
    
    For the detailed security status of bind9 please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/bind9
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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