MGASA-2019-0195 - Updated kernel packages fix security vulnerability

Publication date: 21 Jun 2019
URL: https://advisories.mageia.org/MGASA-2019-0195.html
Type: security
Affected Mageia releases: 6
CVE: CVE-2019-5599,
     CVE-2019-11477,
     CVE-2019-11478,
     CVE-2019-11479

This kernel update is based on the upstream 4.14.127 and fixes atleast
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.

References:
- https://bugs.mageia.org/show_bug.cgi?id=24972
- https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.122
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.123
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.124
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.125
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.126
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.127
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5599
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11477
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11479

SRPMS:
- 6/core/kernel-4.14.127-1.mga6
- 6/core/kernel-userspace-headers-4.14.127-1.mga6
- 6/core/kmod-vboxadditions-6.0.8-4.mga6
- 6/core/kmod-virtualbox-6.0.8-4.mga6
- 6/core/kmod-xtables-addons-2.13-88.mga6
- 6/core/wireguard-tools-0.0.20190601-1.mga6