SB2019121078 - Improperly implemented security feature in samba (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) Improperly implemented security feature (CVE-ID: CVE-2019-14870)

CWE-ID: CWE-358 - Improperly Implemented Security Check for Standard

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect implementation of the DelegationNotAllowed Kerberos feature restriction ("delegation_not_allowed" user attribute) that is not applied when processing protocol transmission requests (S4U2Self) in the AD DC KDC. A remote authenticated user can gain access to sensitive information and functionality within the AD domain.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=fddd8a3d858001f0e0d27c7fd9e1ffddf8ccdd2e
• https://git.alpinelinux.org/aports/commit/?id=9739986c1e03ef958ef47887b03d03d06e6559e3
• https://git.alpinelinux.org/aports/commit/?id=dd552b01b186a01114fb8d877ba15cf1895f0121