High severity · published Feb 17, 2022
CVE-2021-44730
snapd 2.54.2 did not properly validate the location of the snap-confine binary
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
snapd 2.54.2 did not properly validate the location of the snap-confine binary. A local attacker who can hardlink this binary to another location to cause snap-confine to execute other arbitrary binaries and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0; 11.0 · source: NVD
FE
Fedora · Fedoraproject
34; 35 · source: NVD
SN
Snapd · Canonical
through 2.54.2 · source: NVD
UL
Ubuntu Linux · Canonical
18.04; 20.04; 21.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-44730
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-44730
Mailing List
http://www.openwall.com/lists/oss-security/2022/02/18/2
Mailing List
http://www.openwall.com/lists/oss-security/2022/02/23/1
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
Patch
https://ubuntu.com/security/notices/USN-5292-1
Issue Tracking
https://www.debian.org/security/2022/dsa-5080
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