SB2018081447 - NULL pointer dereference in samba (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2018-10918)

The vulnerability allows a remote attacker to cause denial of service attack.

The vulnerability exists due to a NULL pointer deference error when processing directory attributes from the LDB database layer within the DsCrackNames() function in DRSUAPI RPC server. A remote authenticated attacker can send a specially crafted request to the vulnerable samba server, trigger NULL pointer dereference error and crash the affected server.

Successful exploitation of the vulnerability requires that the Samba is configured as an Active Directory Domain Controller.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=2a5d0006bdb59356b99ca90d9b2b6147c0d526f6
• https://git.alpinelinux.org/aports/commit/?id=53e46bd2838462d43bb89139a98f91afc31b6a08
• https://git.alpinelinux.org/aports/commit/?id=d773d4c9846c9af6fff4cf55c1942ce486760f82