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Ubuntu CVE Tracker
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CVE-2021-41617

Priority
Low

Description
sshd in OpenSSH 6.2 through 8.x before 8.8, when certain non-default
configurations are used, allows privilege escalation because supplemental
groups are not initialized as expected. Helper programs for
AuthorizedKeysCommand and AuthorizedPrincipalsCommand may run with
privileges associated with group memberships of the sshd process, if the
configuration specifies running the command as a different user.

References
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41617
https://www.openwall.com/lists/oss-security/2021/09/26/1
https://www.openssh.com/txt/release-8.8
https://www.openssh.com/security.html

Bugs
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995130
https://bugzilla.suse.com/show_bug.cgi?id=1190975

Notes

seth-arnoldopenssh-ssh1 is provided for compatibility with old devices that
cannot be upgraded to modern protocols. Thus we may not provide security
support for this package if doing so would prevent access to equipment.
mdeslaurOnly applies to non-default configurations where
AuthorizedKeysCommand or AuthorizedPrincipalsCommand are used. sespirosCannot
reproduce since sshd for all releases drops supplementary
groups early when it starts with setgroups(0, NULL).

Package
Source: openssh (LP Ubuntu Debian)

Upstream:released (8.8) Ubuntu 18.04 LTS (Bionic Beaver):needed Ubuntu 16.04
FIPS Compliant (Xenial Xerus):needed Ubuntu 20.04 LTS (Focal Fossa):needed
Ubuntu 16.04 FIPS Certified (Xenial Xerus):needed Ubuntu 21.10 (Impish
Indri):needed Ubuntu 16.04 ESM (Xenial Xerus):needed Ubuntu 18.04 FIPS Certified
(Bionic Beaver):needed Ubuntu 20.04 FIPS Certified (Focal Fossa):needed Ubuntu
18.04 FIPS Compliant (Bionic Beaver):needed Ubuntu 14.04 ESM (Trusty
Tahr):needed Ubuntu 20.04 FIPS Compliant (Focal Fossa):needed

Patches:

Upstream:https://github.com/openssh/openssh-portable/commit/f3cbe43e28fe71427d41cfe3a17125b972710455
Upstream:https://github.com/openssh/openssh-portable/commit/bf944e3794eff5413f2df1ef37cddf96918c6bde

Package
Source: openssh-ssh1 (LP Ubuntu Debian)

Upstream:ignored (frozen on openssh 7.5p) Ubuntu 18.04 LTS (Bionic
Beaver):needed Ubuntu 20.04 LTS (Focal Fossa):needed Ubuntu 21.10 (Impish
Indri):needed Ubuntu 14.04 ESM (Trusty Tahr):DNE

Patches:



More Information
 * Mitre
 * NVD
 * Launchpad
 * Debian

Updated: 2022-03-16 20:14:38 UTC (commit
445b1afa62854500e87e0b41e132553415252c73)

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