Link Following Affecting snapd package, versions <2.40-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-SNAPD-345278
- published24 Apr 2019
- disclosed24 Apr 2019
Introduced: 24 Apr 2019
CVE-2019-11503 (opens in a new tab)How to fix?
Upgrade Debian:unstable snapd to version 2.40-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream snapd package and not the snapd package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
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."
References
- https://security-tracker.debian.org/tracker/CVE-2019-11503
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6VACEKVQ7UAZ32WO4ZKCFW6YOBSYJ76L/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VPU6APEZHAA7N2AI57OT4J2P7NKHFOLM/
- https://github.com/snapcore/snapd/pull/6642
- https://www.openwall.com/lists/oss-security/2019/04/18/4
- http://www.openwall.com/lists/oss-security/2019/04/25/7
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2019-11503
- 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/