March 2018 - Arch-security - lists.archlinux.org

[ASA-201803-4] dhcp: denial of service
by Santiago Torres-Arias 06 Mar '18

06 Mar '18

Arch Linux Security Advisory ASA-201803-4 ========================================= Severity: High Date : 2018-03-05 CVE-ID : CVE-2018-5733 Package : dhcp Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-646 Summary ======= The package dhcp before version 4.4.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 4.4.1-1. # pacman -Syu "dhcp>=4.4.1-1" The problem has been fixed upstream in version 4.4.1. Workaround ========== None. Description =========== A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic. Impact ====== A remote attacker is able to crash the dhcpd process by sending large amounts of traffic. References ========== https://kb.isc.org/article/AA-01567 https://lists.isc.org/pipermail/dhcp-announce/2018-February/000418.html https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=197b26f… https://bugs.isc.org/Public/Bug/Display.html?id=47140 https://security.archlinux.org/CVE-2018-5733

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[ASA-201803-3] dhclient: denial of service
by Santiago Torres-Arias 06 Mar '18

06 Mar '18

Arch Linux Security Advisory ASA-201803-3 ========================================= Severity: High Date : 2018-03-05 CVE-ID : CVE-2018-5732 Package : dhclient Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-648 Summary ======= The package dhclient before version 4.4.1-1 is vulnerable to denial of service. Resolution ========== Upgrade to 4.4.1-1. # pacman -Syu "dhclient>=4.4.1-1" The problem has been fixed upstream in version 4.4.1. Workaround ========== None. Description =========== An out-of-bound memory access flaw was found in the way dhclient processed a DHCP response packet. A malicious DHCP server could potentially use this flaw to crash dhclient processes running on DHCP client machines via a crafted DHCP response packet. Impact ====== A remote attacker is able to crash the dhclient processes via a crafted DHCP response packet. References ========== https://kb.isc.org/article/AA-01565 https://lists.isc.org/pipermail/dhcp-announce/2018-February/000418.html https://source.isc.org/cgi-bin/gitweb.cgi?p=dhcp.git;a=commitdiff;h=c593172… https://bugs.isc.org/Public/Bug/Display.html?id=47139 https://security.archlinux.org/CVE-2018-5732

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[ASA-201803-2] mkinitcpio-busybox: arbitrary code execution
by Santiago Torres-Arias 05 Mar '18

05 Mar '18

Arch Linux Security Advisory ASA-201803-2 ========================================= Severity: High Date : 2018-03-01 CVE-ID : CVE-2017-16544 Package : mkinitcpio-busybox Type : arbitrary code execution Remote : No Link : https://security.archlinux.org/AVG-514 Summary ======= The package mkinitcpio-busybox before version 1.28.1-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 1.28.1-1. # pacman -Syu "mkinitcpio-busybox>=1.28.1-1" The problem has been fixed upstream in version 1.28.1. Workaround ========== None. Description =========== In the add_match function in libbb/lineedit.c in BusyBox through 1.27.2, the tab autocomplete feature of the shell, used to get a list of filenames in a directory, does not sanitize filenames and results in executing any escape sequence in the terminal. This could potentially result in code execution, arbitrary file writes, or other attacks. Impact ====== An attacker is able to execute arbitrary code by tricking the user into auto-completing a crafted filename. References ========== https://bugs.archlinux.org/task/56391 https://git.busybox.net/busybox/commit/?id=c3797d40a1c57352192c6106cc0f435e… https://www.twistlock.com/2017/11/20/cve-2017-16544-busybox-autocompletion-… https://security.archlinux.org/CVE-2017-16544

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[ASA-201803-1] busybox: arbitrary code execution
by Santiago Torres-Arias 05 Mar '18

05 Mar '18

Arch Linux Security Advisory ASA-201803-1 ========================================= Severity: High Date : 2018-03-01 CVE-ID : CVE-2017-16544 Package : busybox Type : arbitrary code execution Remote : No Link : https://security.archlinux.org/AVG-512 Summary ======= The package busybox before version 1.28.1-1 is vulnerable to arbitrary code execution. Resolution ========== Upgrade to 1.28.1-1. # pacman -Syu "busybox>=1.28.1-1" The problem has been fixed upstream in version 1.28.1. Workaround ========== None. Description =========== In the add_match function in libbb/lineedit.c in BusyBox through 1.27.2, the tab autocomplete feature of the shell, used to get a list of filenames in a directory, does not sanitize filenames and results in executing any escape sequence in the terminal. This could potentially result in code execution, arbitrary file writes, or other attacks. Impact ====== An attacker is able to execute arbitrary code by tricking the user into auto-completing a crafted filename. References ========== https://bugs.archlinux.org/task/56391 https://git.busybox.net/busybox/commit/?id=c3797d40a1c57352192c6106cc0f435e… https://www.twistlock.com/2017/11/20/cve-2017-16544-busybox-autocompletion-… https://security.archlinux.org/CVE-2017-16544

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