Bug 2056061 (CVE-2021-44730) - CVE-2021-44730 snapd: Hardlink attack in snap-confine's sc_open_snapd_tool()
Summary: CVE-2021-44730 snapd: Hardlink attack in snap-confine's sc_open_snapd_tool()
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-44730
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2056062 2056063
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-02-18 16:42 UTC by Mauro Matteo Cascella
Modified: 2022-03-02 20:50 UTC (History)
4 users (show)

Fixed In Version: snapd 2.54.3
Doc Type: If docs needed, set a value
Doc Text:
A hardlink attack in the snap-confine component (sc_open_snapd_tool) of snapd was found by Qualys. This flaw is exploitable in a non-default configuration only (when the kernel's fs.protected_hardlinks is 0) and could lead to local privilege escalation from any user to root.
Clone Of:
Environment:
Last Closed: 2022-03-02 20:50:58 UTC

Attachments (Terms of Use)

Description Mauro Matteo Cascella 2022-02-18 16:42:22 UTC 
A hardlink attack in the snap-confine component (sc_open_snapd_tool) of snapd was found by Qualys. This flaw is exploitable in a non-default configuration only (when the kernel's fs.protected_hardlinks is 0) and could lead to local privilege escalation from any user to root.

Qualys security advisory:
https://www.qualys.com/2022/02/17/cve-2021-44731/oh-snap-more-lemmings.txt
Comment 1 Mauro Matteo Cascella 2022-02-18 16:42:42 UTC 
Created snapd tracking bugs for this issue:

Affects: epel-all [bug 2056062]
Affects: fedora-all [bug 2056063]
Comment 2 Product Security DevOps Team 2022-03-02 20:50:56 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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