| Beschreibung: | Summary:
The remote host is missing an update for the 'kernel, kernel-userspace-headers, kmod-vboxadditions, kmod-virtualbox, kmod-xtables-addons, wireguard-tools' package(s) announced via the MGASA-2019-0195 advisory.
Vulnerability Insight:
This kernel update is based on the upstream 4.14.127 and fixes at least
the following security issues:
Jonathan Looney discovered that it is possible to send a crafted sequence
of SACKs which will fragment the RACK send map. An attacker may be able to
further exploit the fragmented send map to cause an expensive linked-list
walk for subsequent SACKs received for that same TCP connection
(CVE-2019-5599).
Jonathan Looney discovered that the TCP_SKB_CB(skb)->tcp_gso_segs value
was subject to an integer overflow in the Linux kernel when handling TCP
Selective Acknowledgments (SACKs). A remote attacker could use this to
cause a denial of service (CVE-2019-11477).
Jonathan Looney discovered that the TCP retransmission queue implementation
in tcp_fragment in the Linux kernel could be fragmented when handling
certain TCP Selective Acknowledgment (SACK) sequences. A remote attacker
could use this to cause a denial of service (CVE-2019-11478).
Jonathan Looney discovered that the Linux kernel default MSS is hard-coded
to 48 bytes. This allows a remote peer to fragment TCP resend queues
significantly more than if a larger MSS were enforced. A remote attacker
could use this to cause a denial of service (CVE-2019-11479).
WireGuard has been updated to 0.0.20190601.
For other uptstream fixes in this update, see the referenced changelogs.
Affected Software/OS:
'kernel, kernel-userspace-headers, kmod-vboxadditions, kmod-virtualbox, kmod-xtables-addons, wireguard-tools' package(s) on Mageia 6.
Solution:
Please install the updated package(s).
CVSS Score:
7.8
CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:C
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