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Mageia 8: 2022-0436 Moderate: Dropbear SSH Authentication Problem

Updated dropbear package fixes a security vulnerability in dbclient:. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker . MGASA-2022-0436 - Updated dropbear packages fix security vulnerability Publication date: 24 Nov 2022 URL: https://advisories.mageia.org/MGASA-2022-0436.html Type: security Affected Mageia releases: 8 CVE: CVE-2021-36369 Updated dropbear package fixes a security vulnerability in dbclient:. Due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code, it is possible for an SSH server to change the login process in its favor. This attack can bypass additional security measures such as FIDO2 tokens or SSH-Askpass. Thus, it allows an attacker to abuse a forwarded agent for logging on to another server unnoticed. The fix adds a new option, DisableTrivialAuth, to dbclient to disable this attack vector. Invoke dbclient as "dbclient -o DisableTrivialAuth=yes localhost …" to enable this mitigation on each dbclient invocation. References: - https://bugs.mageia.org/show_bug.cgi?id=31119 - https://github.com/mkj/dropbear/pull/128 - https://www.cve.org/CVERecord?id=CVE-2021-36369 SRPMS: - 8/core/dropbear-2020.81-1.1.mga8 . Recent updates to the dropbear packages in Mageia resolve security vulnerabilities that could enable manipulation of the SSH login procedure.. dropbear security, Mageia advisory, SSH authentication. . LinuxSecurity.com Team

Nov 24, 2022 Mageia