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USN-3587-1: Dovecot vulnerabilities

Ubuntu security notices - 2018.03.05, h - 17:29
Ubuntu Security Notice USN-3587-1

5th March, 2018

dovecot vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
Summary

Several security issues were fixed in Dovecot.

Software description
  • dovecot - IMAP and POP3 email server
Details

It was discovered that Dovecot incorrectly handled parsing certain email
addresses. A remote attacker could use this issue to cause Dovecot to
crash, resulting in a denial of service, or possibly obtain sensitive
information. (CVE-2017-14461)

It was discovered that Dovecot incorrectly handled TLS SNI config lookups.
A remote attacker could possibly use this issue to cause Dovecot to crash,
resulting in a denial of service. (CVE-2017-15130)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 17.10:
dovecot-core 1:2.2.27-3ubuntu1.3
Ubuntu 16.04 LTS:
dovecot-core 1:2.2.22-1ubuntu2.7
Ubuntu 14.04 LTS:
dovecot-core 1:2.2.9-1ubuntu2.4

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

CVE-2017-14461, CVE-2017-15130

Kategóriák: Securiy

USN-3588-1: Memcached vulnerabilities

Ubuntu security notices - 2018.03.05, h - 17:02
memcached vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
Summary

Several security issues were fixed in Memcached.

Software Description
  • memcached - high-performance memory object caching system
Details

Daniel Shapira discovered an integer overflow issue in Memcached. A remote attacker could use this to cause a denial of service (daemon crash). (CVE-2017-9951)

It was discovered that Memcached listened to UDP by default. A remote attacker could use this as part of a distributed denial of service attack. (CVE-2018-1000115)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 17.10
memcached - 1.4.33-1ubuntu3.2
Ubuntu 16.04 LTS
memcached - 1.4.25-2ubuntu1.3
Ubuntu 14.04 LTS
memcached - 1.4.14-0ubuntu9.2

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

Please note that after applying this update, Memcached will no longer listen to UDP by default. If UDP service is desired, please add ‘-U 11211’ to /etc/memcached.conf and restart the memcached service.

References
Kategóriák: Securiy

USN-3575-2: QEMU regression

Ubuntu security notices - 2018.03.05, h - 14:15
Ubuntu Security Notice USN-3575-2

5th March, 2018

qemu regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
Summary

USN-3575-1 introduced a regression in QEMU.

Software description
  • qemu - Machine emulator and virtualizer
Details

USN-3575-1 fixed vulnerabilities in QEMU. The fix for CVE-2017-11334 caused
a regression in Xen environments. This update removes the problematic fix
pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that QEMU incorrectly handled guest ram. A privileged
attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS
and Ubuntu 16.04 LTS. (CVE-2017-11334)

David Buchanan discovered that QEMU incorrectly handled the VGA device. A
privileged attacker inside the guest could use this issue to cause QEMU to
crash, resulting in a denial of service. This issue was only addressed in
Ubuntu 17.10. (CVE-2017-13672)

Thomas Garnier discovered that QEMU incorrectly handled multiboot. An
attacker could use this issue to cause QEMU to crash, resulting in a denial
of service, or possibly execute arbitrary code on the host. In the default
installation, when QEMU is used with libvirt, attackers would be isolated
by the libvirt AppArmor profile. This issue only affected Ubuntu 14.04 LTS
and Ubuntu 16.04 LTS. (CVE-2017-14167)

Tuomas Tynkkynen discovered that QEMU incorrectly handled VirtFS directory
sharing. An attacker could use this issue to obtain sensitive information
from host memory. (CVE-2017-15038)

Eric Blake discovered that QEMU incorrectly handled memory in the
NBD server. An attacker could use this issue to cause the NBD server to
crash, resulting in a denial of service. This issue only affected Ubuntu
17.10. (CVE-2017-15118)

Eric Blake discovered that QEMU incorrectly handled certain options to the
NBD server. An attacker could use this issue to cause the NBD server to
crash, resulting in a denial of service. This issue only affected Ubuntu
14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-15119)

Daniel Berrange discovered that QEMU incorrectly handled the VNC server. A
remote attacker could possibly use this issue to consume memory, resulting
in a denial of service. This issue was only addressed in Ubuntu 17.10.
(CVE-2017-15124)

Carl Brassey discovered that QEMU incorrectly handled certain websockets. A
remote attacker could possibly use this issue to consume memory, resulting
in a denial of service. This issue only affected Ubuntu 17.10.
(CVE-2017-15268)

Guoxiang Niu discovered that QEMU incorrectly handled the Cirrus VGA
device. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service. (CVE-2017-15289)

Cyrille Chatras discovered that QEMU incorrectly handled certain PS2 values
during migration. An attacker could possibly use this issue to cause QEMU
to crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10.
(CVE-2017-16845)

It was discovered that QEMU incorrectly handled the Virtio Vring
implementation. An attacker could possibly use this issue to cause QEMU to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS and Ubuntu 17.10. (CVE-2017-17381)

Eric Blake discovered that QEMU incorrectly handled certain rounding
operations. An attacker could possibly use this issue to cause QEMU to
crash, resulting in a denial of service. This issue only affected Ubuntu
14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-18043)

Jiang Xin and Lin ZheCheng discovered that QEMU incorrectly handled the
VGA device. A privileged attacker inside the guest could use this issue to
cause QEMU to crash, resulting in a denial of service. (CVE-2018-5683)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 16.04 LTS:
qemu 1:2.5+dfsg-5ubuntu10.24
Ubuntu 14.04 LTS:
qemu 2.0.0+dfsg-2ubuntu1.40

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References

LP: 1752761

Kategóriák: Securiy

USN-3586-1: DHCP vulnerabilities

Ubuntu security notices - 2018.03.01, cs - 21:24
Ubuntu Security Notice USN-3586-1

1st March, 2018

isc-dhcp vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
Summary

Several security issues were fixed in DHCP.

Software description
  • isc-dhcp - DHCP server and client
Details

Konstantin Orekhov discovered that the DHCP server incorrectly handled a
large number of concurrent TCP sessions. A remote attacker could possibly
use this issue to cause a denial of service. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2774)

It was discovered that the DHCP server incorrectly handled socket
descriptors. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2017-3144)

Felix Wilhelm discovered that the DHCP client incorrectly handled certain
malformed responses. A remote attacker could use this issue to cause the
DHCP client to crash, resulting in a denial of service, or possibly execute
arbitrary code. In the default installation, attackers would be isolated by
the dhclient AppArmor profile. (CVE-2018-5732)

Felix Wilhelm discovered that the DHCP server incorrectly handled reference
counting. A remote attacker could possibly use this issue to cause the DHCP
server to crash, resulting in a denial of service. (CVE-2018-5733)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 17.10:
isc-dhcp-server 4.3.5-3ubuntu2.2
isc-dhcp-relay 4.3.5-3ubuntu2.2
isc-dhcp-client 4.3.5-3ubuntu2.2
isc-dhcp-server-ldap 4.3.5-3ubuntu2.2
Ubuntu 16.04 LTS:
isc-dhcp-server 4.3.3-5ubuntu12.9
isc-dhcp-relay 4.3.3-5ubuntu12.9
isc-dhcp-client 4.3.3-5ubuntu12.9
isc-dhcp-server-ldap 4.3.3-5ubuntu12.9
Ubuntu 14.04 LTS:
isc-dhcp-server 4.2.4-7ubuntu12.12
isc-dhcp-relay 4.2.4-7ubuntu12.12
isc-dhcp-client 4.2.4-7ubuntu12.12
isc-dhcp-server-ldap 4.2.4-7ubuntu12.12

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

CVE-2016-2774, CVE-2017-3144, CVE-2018-5732, CVE-2018-5733

Kategóriák: Securiy

Inkscape sorozat (negyedik különkiadás): 22–28. rész

Ubuntu magyar közösség - 2018.03.01, cs - 18:11

Folytatjuk az Inkscape cikksorozat különkiadását. A cikksorozat 22–28. részeivel, semmi extra, csak a tények.

Ne feledkezzetek meg az eredeti kiadási dátumokról. A hardver és szoftver jelenlegi verziói eltérhetnek az akkor közöltektől, ellenőrizzétek a verziószámokat, mielőtt kipróbáljátok a cikkekben leírtakat. Nem feltétlenül fog működni az akkori megoldás a mostani rendszereken.

Ez a kiadás letölthető a szokásos PDF változatban.

Letöltés: Inkscape 22–28. rész

Jó olvasgatást!

Inkscape sorozat 4. rész – 22-28. részek

Full Circle Magazin - 2018.03.01, cs - 17:55

Nehogy unatkozzanak a kedves rajzolni vágyó olvasók, az „Inkscape” sorozat 4. kötetét is közreadjuk. Ebben a kiadásban a 22 – 28. részt lehet megtalálni, semmi extra, csak a tények.

 

Kérlek, ne feledkezz meg az eredeti kiadási dátumról. A hardver és szoftver jelenlegi verziói eltérhetnek az akkor közöltektől, így ellenőrizd a hardvered és szoftvered verzióit, mielőtt megpróbálod emulálni/utánozni a különkiadásokban lévő ismertetőket. Előfordulhat, hogy a szoftver későbbi verziói vannak meg neked, vagy érhetők el a kiadásod tárolóiban.

Inkscape sorozat 4. rész (0)

USN-3579-2: LibreOffice regression

Ubuntu security notices - 2018.03.01, cs - 03:24
Ubuntu Security Notice USN-3579-2

28th February, 2018

libreoffice regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.10
Summary

USN-3579-1 caused a regression in LibreOffice.

Software description
  • libreoffice - Office productivity suite
Details

USN-3579-1 fixed a vulnerability in LibreOffice. After upgrading, it was
no longer possible for LibreOffice to open documents from certain
locations outside of the user's home directory. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that =WEBSERVICE calls in a document could be used to
read arbitrary files. If a user were tricked in to opening a specially
crafted document, a remote attacker could exploit this to obtain sensitive
information. (CVE-2018-6871)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 17.10:
libreoffice-common 1:5.4.5-0ubuntu0.17.10.4

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart LibreOffice to make
all the necessary changes.

References

LP: 1751005

Kategóriák: Securiy

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