Debian: DSA-4272-1: linux security update

    Date14 Aug 2018
    CategoryDebian
    4862
    Posted ByAnthony Pell
    CVE-2018-5391 (FragmentSmack) Juha-Matti Tilli discovered a flaw in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote
    
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    Debian Security Advisory DSA-4272-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    August 14, 2018                       https://www.debian.org/security/faq
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    Package        : linux
    CVE ID         : CVE-2018-5391
    
    CVE-2018-5391 (FragmentSmack)
    
        Juha-Matti Tilli discovered a flaw in the way the Linux kernel
        handled reassembly of fragmented IPv4 and IPv6 packets. A remote
        attacker can take advantage of this flaw to trigger time and
        calculation expensive fragment reassembly algorithms by sending
        specially crafted packets, leading to remote denial of service.
    
        This is mitigated by reducing the default limits on memory usage
        for incomplete fragmented packets.  The same mitigation can be
        achieved without the need to reboot, by setting the sysctls:
    
        net.ipv4.ipfrag_high_thresh = 262144
        net.ipv6.ip6frag_high_thresh = 262144
        net.ipv4.ipfrag_low_thresh = 196608
        net.ipv6.ip6frag_low_thresh = 196608
    
        The default values may still be increased by local configuration
        if necessary.
    
    For the stable distribution (stretch), this problem has been fixed in
    version 4.9.110-3+deb9u2.
    
    We recommend that you upgrade your linux packages.
    
    For the detailed security status of linux please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/linux
    
    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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