CVE-2019-18837 - Improper Link Resolution Before File Access ('Link Following')

Severity

86%

Complexity

39%

Confidentiality

66%

An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.

An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.

CVSS 3.1 Base Score 8.6. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N).

CVSS 2.0 Base Score 5. CVSS Attack Vector: network. CVSS Attack Complexity: low. CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N).

Overview

Type

Fedora

First reported 5 years ago

2019-11-13 20:15:00

Last updated 5 years ago

2019-11-18 17:20:00

Affected Software

Fedora 30

30

Fedora 31

31

References

https://github.com/containers/crun/pull/173

Patch

https://github.com/containers/crun/releases/tag/0.10.5

Release Notes

https://lists.fedoraproject.org/archives/list/[email protected]/message/DTA5SJUAKQUK6HRY2CZVJUIZP5BO3EOG/

Third Party Advisory

https://lists.fedoraproject.org/archives/list/[email protected]/message/ITB2UNEGHXZUR3ATYHWPSK5LJB36N7AP/

Third Party Advisory

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