==========================================================================
\nUbuntu Security Notice USN-5292-4
\nFebruary 24, 2022<\/p>\n
snapd regression
\n==========================================================================<\/p>\n
A security issue affects these releases of Ubuntu and its derivatives:<\/p>\n
– Ubuntu 21.10
\n– Ubuntu 20.04 LTS
\n– Ubuntu 18.04 LTS
\n– Ubuntu 16.04 ESM
\n– Ubuntu 14.04 ESM<\/p>\n
Summary:<\/p>\n
USN-5292-1 introduced a regression in snapd.<\/p>\n
Software Description:
\n– snapd: Daemon and tooling that enable snap packages<\/p>\n
Details:<\/p>\n
USN-5292-1 fixed a vulnerability in snapd. Unfortunately that update introduced
\na regression that could break the fish shell. This update fixes the problem.<\/p>\n
We apologize for the inconvenience.<\/p>\n
Original advisory details:<\/p>\n
James Troup discovered that snap did not properly manage the permissions for
\nthe snap directories. A local attacker could possibly use this issue to expose
\nsensitive information. (CVE-2021-3155)<\/p>\n
Ian Johnson discovered that snapd did not properly validate content interfaces
\nand layout paths. A local attacker could possibly use this issue to inject
\narbitrary AppArmor policy rules, resulting in a bypass of intended access
\nrestrictions. (CVE-2021-4120)<\/p>\n
The Qualys Research Team discovered that snapd did not properly validate the
\nlocation of the snap-confine binary. A local attacker could possibly use this
\nissue to execute other arbitrary binaries and escalate privileges.
\n(CVE-2021-44730)<\/p>\n
The Qualys Research Team discovered that a race condition existed in the snapd
\nsnap-confine binary when preparing a private mount namespace for a snap. A
\nlocal attacker could possibly use this issue to escalate privileges and
\nexecute arbitrary code. (CVE-2021-44731)<\/p>\n
Update instructions:<\/p>\n
The problem can be corrected by updating your system to the following
\npackage versions:<\/p>\n
Ubuntu 21.10:
\nsnap-confine 2.54.3+21.10.1ubuntu0.2
\nsnapd 2.54.3+21.10.1ubuntu0.2<\/p>\n
Ubuntu 20.04 LTS:
\nsnap-confine 2.54.3+20.04.1ubuntu0.2
\nsnapd 2.54.3+20.04.1ubuntu0.2<\/p>\n
Ubuntu 18.04 LTS:
\nsnap-confine 2.54.3+18.04.2ubuntu0.2
\nsnapd 2.54.3+18.04.2ubuntu0.2<\/p>\n
Ubuntu 16.04 ESM:
\nsnap-confine 2.54.3+16.04.0ubuntu0.1~esm4
\nsnapd 2.54.3+16.04.0ubuntu0.1~esm4<\/p>\n
Ubuntu 14.04 ESM:
\nsnap-confine 2.54.3+14.04.0ubuntu0.1~esm3
\nsnapd 2.54.3+14.04.0ubuntu0.1~esm3<\/p>\n
In general, a standard system update will make all the necessary changes.<\/p>\n
References:
\nhttps:\/\/ubuntu.com\/security\/notices\/USN-5292-4
\nhttps:\/\/ubuntu.com\/security\/notices\/USN-5292-1
\nhttps:\/\/bugs.launchpad.net\/ubuntu\/+source\/snapd\/+bug\/1961365, https:\/\/bugs.launchpad.net\/ubuntu\/+source\/snapd\/+bug\/1961791<\/p>\n
Package Information:
\nhttps:\/\/launchpad.net\/ubuntu\/+source\/snapd\/2.54.3+21.10.1ubuntu0.2
\nhttps:\/\/launchpad.net\/ubuntu\/+source\/snapd\/2.54.3+20.04.1ubuntu0.2
\nhttps:\/\/launchpad.net\/ubuntu\/+source\/snapd\/2.54.3+18.04.2ubuntu0.2<\/p>\n","protected":false},"excerpt":{"rendered":"
========================================================================== Ubuntu Security Notice USN-5292-4 February 24, 2022 snapd regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: – Ubuntu 21.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS – Ubuntu 16.04 ESM – Ubuntu 14.04 ESM Summary: USN-5292-1 introduced a regression in snapd. Software Description: – snapd: Daemon and tooling …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-21043","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/21043","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=21043"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/21043\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=21043"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=21043"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=21043"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}