[SECURITY] [DSA 4272-1] linux security update

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

- -------------------------------------------------------------------------
Debian Security Advisory DSA-4272-1                   security@xxxxxxxxxx
https://www.debian.org/security/                     Salvatore Bonaccorso
August 14, 2018                       https://www.debian.org/security/faq
- -------------------------------------------------------------------------

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: debian-security-announce@xxxxxxxxxxxxxxxx
-----BEGIN PGP SIGNATURE-----
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=WPm5
-----END PGP SIGNATURE-----




[Index of Archives]     [Linux Security]     [Netfilter]     [PHP]     [Yosemite News]     [Linux Kernel]

  Powered by Linux