#ubuntu

Ubuntu Security Notice 6654-1 - It was discovered that Roundcube Webmail incorrectly sanitized characters in the linkrefs text messages. An attacker could possibly use this issue to execute a cross-site scripting attack.

This Metasploit module exploits an authentication bypass vulnerability that allows an unauthenticated attacker to create a new administrator user account on a vulnerable ConnectWise ScreenConnect server. The attacker can leverage this to achieve remote code execution by uploading a malicious extension module. All versions of ScreenConnect version 23.9.7 and below are affected.

Ubuntu Security Notice 6649-1 - 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. Alfred Peters discovered that Firefox did not properly manage memory when storing and re-accessing data on a networking channel. An attacker could potentially exploit this issue to cause a denial of service.

Ubuntu Security Notice 6648-1 - It was discovered that a race condition existed in the AppleTalk networking subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Zhenghan Wang discovered that the generic ID allocator implementation in the Linux kernel did not properly check for null bitmap when releasing IDs. A local attacker could use this to cause a denial of service.

Ubuntu Security Notice 6647-1 - It was discovered that a race condition existed in the ATM subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the Rose X.25 protocol implementation in the Linux kernel, leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Ubuntu Security Notice 6646-1 - It was discovered that a race condition existed in the ATM subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that a race condition existed in the Rose X.25 protocol implementation in the Linux kernel, leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

Ubuntu Security Notice 6584-2 - USN-6584-1 fixed several vulnerabilities in Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. This update provides the corresponding updates for CVE-2021-33912 andCVE-2021-33913 in Ubuntu 16.04 LTS. Philipp Jeitner and Haya Shulman discovered that Libspf2 incorrectly handled certain inputs. If a user or an automated system were tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

Ubuntu Security Notice 6645-1 - It was discovered that the netfilter connection tracker for netlink in the Linux kernel did not properly perform reference counting in some error conditions. A local attacker could possibly use this to cause a denial of service.

We have identified a cross-site websocket hijacking (CSWSH) vulnerability within the control.ashx endpoint of MeshCentral. This component is the primary mechanism used within MeshCentral to perform administrative actions on the server. To demonstrate the impact of the vulnerability we developed a proof-of-concept which leveraged the cross-site websocket hijacking vulnerability to read the server configuration file to leak the sessionKey variable, generating login tokens, and generating an authentication cookie. The vulnerability is exploitable when an attacker is able to convince a victim end-user to click on a malicious link to a page hosting an attacker-controlled site. The attacker can then originate a cross-site websocket connection using client-side JavaScript code to connect to “control.ashx” as the victim user within MeshCentral. There are some caveats to exploiting this issue however as MeshCentral configures `SameSite=Lax` security setting on cookies which introduces some add...

Ubuntu Security Notice 6644-1 - It was discovered that LibTIFF incorrectly handled certain files. If a user were tricked into opening a specially crafted file, an attacker could possibly use this issue to cause the application to crash, resulting in a denial of service. It was discovered that LibTIFF incorrectly handled certain image files with the tiffcp utility. If a user were tricked into opening a specially crafted image file, an attacker could possibly use this issue to cause tiffcp to crash, resulting in a denial of service.