CVE-2021-44731
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.94%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code 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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.94% probability · 59th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- canonical/snapd · canonical/ubuntu linux · fedoraproject/fedora · debian/debian linux
- Source
- security@ubuntu.com
References
- http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2022/Dec/4Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/18/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/23/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/23/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/11/30/2Exploit, Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
- https://ubuntu.com/security/notices/USN-5292-1Patch, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5080Issue Tracking, Third Party Advisory
- http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.htmlExploit, Third Party Advisory, VDB Entry
- http://seclists.org/fulldisclosure/2022/Dec/4Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/18/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/23/1Exploit, Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/02/23/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/11/30/2Exploit, Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3QTBN7LLZISXIA4KU4UKDR27Q5PXDS2U/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XCGHG6LJAVJJ72TMART6A7N4Z6MSTGI7/
- https://ubuntu.com/security/notices/USN-5292-1Patch, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5080Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.