Qualys discovered a race condition (CVE-2022-3328) in snap-confine, a SUID-root program installed by default on Ubuntu. In this advisory,they tell the story of this vulnerability (which was introduced in February 2022 by the patch for CVE-2021-44731) and detail how they exploited it in Ubuntu Server (a local privilege escalation, from any user to root) by combining it with two vulnerabilities in multipathd (an authorization bypass and a symlink attack, CVE-2022-41974 and CVE-2022-41973).
ae9802d4db6010e09c5ca96ad72cd8f9bb70aff4d7af8a1ec00cebd3203d1f95Debian Linux Security Advisory 5080-1 - Multiple vulnerabilties were discovered in snapd, a daemon and tooling that enable Snap packages, which could result in bypass of access restrictions or privilege escalation.
7aa8df4f541b162dac303b93aaa55309b14be4e5e525a23d7c6f864f2333f2d1Ubuntu Security Notice 5292-4 - USN-5292-1 fixed a vulnerability in snapd. Unfortunately that update introduced a regression that could break the fish shell. This update fixes the problem. James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information. Ian Johnson discovered that snapd did not properly validate content interfaces and layout paths. A local attacker could possibly use this issue to inject arbitrary AppArmor policy rules, resulting in a bypass of intended access restrictions. The Qualys Research Team discovered that snapd did not properly validate the location of the snap-confine binary. A local attacker could possibly use this issue to execute other arbitrary binaries and escalate privileges. The Qualys Research Team discovered that a race condition existed in the snapd snap-confine binary when preparing a private mount namespace for a snap. A local attacker could possibly use this issue to escalate privileges and execute arbitrary code.
169abf80da0290c7a605e413fa2b7a41d8a2c57ded0ed852147dda380b2de9a5Ubuntu Security Notice 5292-3 - USN-5292-1 fixed several vulnerabilities in snapd. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information. Ian Johnson discovered that snapd did not properly validate content interfaces and layout paths. A local attacker could possibly use this issue to inject arbitrary AppArmor policy rules, resulting in a bypass of intended access restrictions. The Qualys Research Team discovered that snapd did not properly validate the location of the snap-confine binary. A local attacker could possibly use this issue to execute other arbitrary binaries and escalate privileges. The Qualys Research Team discovered that a race condition existed in the snapd snap-confine binary when preparing a private mount namespace for a snap. A local attacker could possibly use this issue to escalate privileges and execute arbitrary code.
23fb2407472813360c266bf4444366a9b1f39826d88b86b3b54675092a32d4ecUbuntu Security Notice 5292-2 - USN-5292-1 fixed vulnerabilities in snapd. This update provides the corresponding update for the riscv64 architecture. James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information.
0c6bd21fafc633dfdaa09088d54dc04cc7a81354d0f9a2be6b57f8f4dccd6efaUbuntu Security Notice 5292-1 - James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information. Ian Johnson discovered that snapd did not properly validate content interfaces and layout paths. A local attacker could possibly use this issue to inject arbitrary AppArmor policy rules, resulting in a bypass of intended access restrictions.
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