SB2018092402 - Information disclosure in SQL Server Management Studio

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2018-8527)

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

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

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to unspecified error when processing XEL files. A local user with privileges to read data on SQL server can gain unauthorized access to sensitive information stored in database and on the filesystem.

Note: this vulnerability seems to be unintentionally disclosed by Microsoft before the official patch release.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8527
• http://hyp3rlinx.altervista.org/advisories/MICROSOFT-SQL-SERVER-MGMT-STUDIO-XEL-FILETYPE-XML-INJECTI...
• https://www.zerodayinitiative.com/advisories/ZDI-18-1131/