#ubuntu

Microsoft has released security updates to fix a total of 118 vulnerabilities across its software portfolio, two of which have come under active exploitation in the wild. Of the 118 flaws, three are rated Critical, 113 are rated Important, and two are rated Moderate in severity. The Patch Tuesday update doesn't include the 25 additional flaws that the tech giant addressed in its Chromium-based

Ubuntu Security Notice 7057-1 - It was discovered that WEBrick incorrectly handled having both a Content- Length header and a Transfer-Encoding header. A remote attacker could possibly use this issue to perform a HTTP request smuggling attack.

Ubuntu Security Notice 7043-3 - USN-7043-1 fixed a vulnerability in cups-filters. This update provides the corresponding update for Ubuntu 16.04 LTS Simone Margaritelli discovered that the cups-filters cups-browsed component could be used to create arbitrary printers from outside the local network. In combination with issues in other printing components, a remote attacker could possibly use this issue to connect to a system, created manipulated PPD files, and execute arbitrary code when a printer is used. This update disables support for the legacy CUPS printer discovery protocol.

Ubuntu Security Notice 7041-3 - USN-7041-1 fixed a vulnerability in CUPS. This update provides the corresponding update for Ubuntu 16.04 LTS. Simone Margaritelli discovered that CUPS incorrectly sanitized IPP data when creating PPD files. A remote attacker could possibly use this issue to manipulate PPD files and execute arbitrary code when a printer is used.

Ubuntu Security Notice 7056-1 - Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information across domains, or execute arbitrary code. Masato Kinugawa discovered that Firefox did not properly validate javascript under the "resource://pdf.js" origin. An attacker could potentially exploit this issue to execute arbitrary javascript code and access cross-origin PDF content.

Ubuntu Security Notice 7053-1 - It was discovered that ImageMagick incorrectly handled certain malformed image files. If a user or automated system using ImageMagick were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or potentially leak sensitive information. These vulnerabilities included heap and stack-based buffer overflows, memory leaks, and improper handling of uninitialized values.

Ubuntu Security Notice 7055-1 - Goldberg, Miro Haller, Nadia Heninger, Mike Milano, Dan Shumow, Marc Stevens, and Adam Suhl discovered that FreeRADIUS incorrectly authenticated certain responses. An attacker able to intercept communications between a RADIUS client and server could possibly use this issue to forge responses, bypass authentication, and access network devices and services. This update introduces new configuration options called "limit_proxy_state" and "require_message_authenticator" that default to "auto" but should be set to "yes" once all RADIUS devices have been upgraded on a network.

Ubuntu Security Notice 7054-1 - It was discovered that unzip did not properly handle unicode strings under certain circumstances. If a user were tricked into opening a specially crafted zip file, an attacker could possibly use this issue to cause unzip to crash, resulting in a denial of service, or possibly execute arbitrary code.

Authd PAM module up to version 0.3.4 can allow broker-managed users to impersonate any other user managed by the same broker and perform any PAM operation with it, including authenticating as them. This is possible using tools such as `su`, `sudo` or `ssh` (and potentially others) that, so far, do not ensure that the PAM user at the end of the transaction is matching the one who initiated the transaction. Authd 0.3.5 fixes this by not allowing changing the user unless it was never set before in the PAM stack. `su` version that will include https://github.com/util-linux/util-linux/pull/3206 will not be affected `ssh` version that will include https://github.com/openssh/openssh-portable/pull/521 will not be affected `sudo` version that will include https://github.com/sudo-project/sudo/pull/412 will not be affected `login` not affected `passwd` not affected <details> <summary>Old report</summary> ### Summary An user can access as another user using its own credentials ### Details ...

`JUJU_CONTEXT_ID` is the authentication measure on the unit hook tool abstract domain socket. It looks like `JUJU_CONTEXT_ID=appname/0-update-status-6073989428498739633`. This value looks fairly unpredictable, but due to the random source used, it is highly predictable. `JUJU_CONTEXT_ID` has the following components: - the application name - the unit number - the hook being currently run - a uint63 decimal number On a system the application name and unit number can be deduced by reading the structure of the filesystem. The current hook being run is not easily deduce-able, but is a limited set of possible values, so one could try them all. Finally the random number, this is generated from a non cryptographically secure random source. Specifically the random number generator built into the go standard library, using the current unix time in seconds (at startup) as the seed. There is no rate limiting on the abstract domain socket, the only limiting factor is time (window of time the h...