Linux Security
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    Debian: DSA-4133-1: isc-dhcp security update

    Date 07 Mar 2018
    6473
    Posted By Anthony Pell
    Several vulnerabilities have been discovered in the ISC DHCP client, relay and server. The Common Vulnerabilities and Exposures project identifies the following issues:
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-4133-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    March 07, 2018                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : isc-dhcp
    CVE ID         : CVE-2017-3144 CVE-2018-5732 CVE-2018-5733
    Debian Bug     : 887413 891785 891786
    
    Several vulnerabilities have been discovered in the ISC DHCP client,
    relay and server. The Common Vulnerabilities and Exposures project
    identifies the following issues:
    
    CVE-2017-3144
    
        It was discovered that the DHCP server does not properly clean up
        closed OMAPI connections, which can lead to exhaustion of the pool
        of socket descriptors available to the DHCP server, resulting in
        denial of service.
    
    CVE-2018-5732
    
        Felix Wilhelm of the Google Security Team discovered that the DHCP
        client is prone to an out-of-bound memory access vulnerability when
        processing specially constructed DHCP options responses, resulting
        in potential execution of arbitrary code by a malicious DHCP server.
    
    CVE-2018-5733
    
        Felix Wilhelm of the Google Security Team discovered that the DHCP
        server does not properly handle reference counting when processing
        client requests. A malicious client can take advantage of this flaw
        to cause a denial of service (dhcpd crash) by sending large amounts
        of traffic.
    
    For the oldstable distribution (jessie), these problems have been fixed
    in version 4.3.1-6+deb8u3.
    
    For the stable distribution (stretch), these problems have been fixed in
    version 4.3.5-3+deb9u1.
    
    We recommend that you upgrade your isc-dhcp packages.
    
    For the detailed security status of isc-dhcp please refer to its
    security tracker page at:
    https://security-tracker.debian.org/tracker/isc-dhcp
    
    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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