SB2018100929 - Information disclosure in Microsoft SQL Server Management Studio

Description

This security bulletin contains information about 2 vulnerabilities.

1) XXE attack (CVE-ID: CVE-2018-8532)

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 conduct XXE-attack.

The vulnerability exists due to an error when parsing a malicious XMLA file containing a reference to an external entity. A remote attacker can trick the victim into opening a specially crafted XML file and gain access to potentially sensitive information.

2) XXE attack (CVE-ID: CVE-2018-8533)

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 conduct XXE-attack.

The vulnerability exists due to an error when parsing a malicious REGSRVR file containing a reference to an external entity. A remote attacker can trick the victim into opening a specially crafted XML file and gain access to potentially sensitive information.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8532
• http://hyp3rlinx.altervista.org/advisories/MICROSOFT-SQL-SERVER-MGMT-STUDIO-XMLA-FILETYPE-XML-INJECT...
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8533
• http://hyp3rlinx.altervista.org/advisories/MICROSOFT-SQL-SERVER-MGMT-STUDIO-REGSRVR-FILES-XML-INJECT...