CVE-2019-11503

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-04-24 · updated 2026-06-17
Weakness: CWE-59

Description

snap-confine as included in snapd before 2.39 did not guard against symlink races when performing the chdir() to the current working directory of the calling user, aka a "cwd restore permission bypass."

Affected products

Canonical Ltd. snapd: before 2.39 — fixed in 2.39

How to fix

Upgrade to a fixed version: Canonical Ltd. snapd 2.39. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2019/04/25/7
https://github.com/snapcore/snapd/pull/6642
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6VACEKVQ7UAZ32WO4ZKCFW6YOBSYJ76L/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VPU6APEZHAA7N2AI57OT4J2P7NKHFOLM/
https://www.openwall.com/lists/oss-security/2019/04/18/4
http://www.openwall.com/lists/oss-security/2019/04/25/7
https://github.com/snapcore/snapd/pull/6642
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6VACEKVQ7UAZ32WO4ZKCFW6YOBSYJ76L/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VPU6APEZHAA7N2AI57OT4J2P7NKHFOLM/
https://www.openwall.com/lists/oss-security/2019/04/18/4

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