SB2019051802 - Improper Authentication in samba (Alpine package)
Published: May 18, 2019
Security Bulletin ID
SB2019051802
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Authentication (CVE-ID: CVE-2018-16860)
The vulnerability allows a remote authenticated user to compromise vulnerable domain.
The vulnerability exists due to an error within the process of obtaining kerberos ticket for a service from the Kerberos Key Distribution Center (KDC) that involves S4U2Self and S4U2Proxy extensions. A remote authenticated user can impersonate another service on the network and obtain elevated privileges within the domain.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable Active Directory implementation.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=7f6e6b03d2536a389bb79a29915bd3a8fe881517
- https://git.alpinelinux.org/aports/commit/?id=a80d49fcecdaa5350d709fc4e9b5d71716661eb7
- https://git.alpinelinux.org/aports/commit/?id=bcc49b4c70d8234ad73c32628b01f58554ec5b5e
- https://git.alpinelinux.org/aports/commit/?id=358e0341238ac9f457328893b2974e256e37693f
- https://git.alpinelinux.org/aports/commit/?id=62d88ba3b7c2ed610aaf68d2a5a5956f6e702708
- https://git.alpinelinux.org/aports/commit/?id=e6b1fa7dad551ad0f3cbb54319d7b8d38ed40ddb
- https://git.alpinelinux.org/aports/commit/?id=5ee28b356b1b4aebf9d9fafa32c82c7519cbecd9
- https://git.alpinelinux.org/aports/commit/?id=aa2d24fab1e16e497512004aa40a11c032fcab73
- https://git.alpinelinux.org/aports/commit/?id=d3d301001ca95af4473c3a52c9bccd9950b7b04c
- https://git.alpinelinux.org/aports/commit/?id=d7f01c593b1ee60783bd9bf1b13f1ef234896a10
- https://git.alpinelinux.org/aports/commit/?id=47edd290d1ad530be52e98617325c29417d47cf1