These are the Ubuntu security notices that affect the current supported releases of Ubuntu. These notices are also posted to the ubuntu-security-announce mailing list (list archive). To report a security vulnerability in an Ubuntu package, please contact the Ubuntu Security Team. You may also be interested in learning about Ubuntu security policies. For more details on a specific CVE or source package, please see the Ubuntu CVE Tracker.

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Latest notices

USN-4278-3: Firefox regressions

USN-4278-1 fixed vulnerabilities in Firefox. The update introduced various minor regressions. This update fixes the problem. We apologize for the inconvenience. Original advisory details: Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially …

26 February 2020 | ubuntu-19.10, ubuntu-18.04-lts

USN-4278-2: Firefox vulnerabilities

USN-4278-1 fixed vulnerabilities in Firefox. This update provides the corresponding update for Ubuntu 16.04 LTS. Original advisory details: Multiple security issues were discovered in Firefox. If a user were tricked in to opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, conduct…

26 February 2020 | ubuntu-16.04-lts

USN-4292-1: rsync vulnerabilities

It was discovered that rsync incorrectly handled pointer arithmetic in zlib. An attacker could use this issue to cause rsync to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-9840, CVE-2016-9841) It was discovered that rsync incorrectly handled vectors involving left shifts of negative integers in zlib. An…

25 February 2020 | ubuntu-18.04-lts, ubuntu-16.04-lts

USN-4291-1: mod-auth-mellon vulnerability

It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly use this issue to redirect a user to a malicious URL.

24 February 2020 | ubuntu-19.10, ubuntu-18.04-lts

USN-4290-1: libpam-radius-auth vulnerability

It was discovered that libpam-radius-auth incorrectly handled certain long passwords. A remote attacker could possibly use this issue to cause libpam-radius-auth to crash, resulting in a denial of service.

24 February 2020 | ubuntu-19.10, ubuntu-18.04-lts, ubuntu-16.04-lts

USN-4289-1: Squid vulnerabilities

Jeriko One discovered that Squid incorrectly handled memory when connected to an FTP server. A remote attacker could possibly use this issue to obtain sensitive information from Squid memory. (CVE-2019-12528) Regis Leroy discovered that Squid incorrectly handled certain HTTP requests. A remote attacker could possibly use this issue to access…

20 February 2020 | ubuntu-19.10, ubuntu-18.04-lts, ubuntu-16.04-lts

USN-4288-1: ppp vulnerability

It was discovered that ppp incorrectly handled certain rhostname values. A remote attacker could use this issue to cause ppp to crash, resulting in a denial of service, or possibly execute arbitrary code.

20 February 2020 | ubuntu-19.10, ubuntu-18.04-lts, ubuntu-16.04-lts

USN-4279-2: PHP regression

USN-4279-1 fixed vulnerabilities in PHP. The updated packages caused a regression. This update fixes the problem. We apologize for the inconvenience. Original advisory details: It was discovered that PHP incorrectly handled certain scripts. An attacker could possibly use this issue to cause a denial of service. This issue only affected…

19 February 2020 | ubuntu-16.04-lts

USN-4284-1: Linux kernel vulnerabilities

It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. (CVE-2019-14615) It was discovered that the Atheros 802.11ac wireless USB device driver in the Linux kernel did not properly validate device…

19 February 2020 | ubuntu-19.10, ubuntu-18.04-lts

USN-4287-2: Linux kernel (Azure) vulnerabilities

USN-4287-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux kernel for Microsoft Azure Cloud systems for Ubuntu 14.04 ESM. It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local…

18 February 2020 | ubuntu-14.04-esm