SB2019081546 - Security Features in TortoiseSVN

Description

This security bulletin contains information about 1 vulnerability.

1) Security Features (CVE-ID: CVE-2019-14422)

CWE-ID: CWE-254 - Security Features

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

An issue was discovered in in TortoiseSVN 1.12.1. The Tsvncmd: URI handler allows a customised diff operation on Excel workbooks, which could be used to open remote workbooks without protection from macro security settings to execute arbitrary code. A tsvncmd:command:diff?path:[file1]?path2:[file2] URI will execute a customised diff on [file1] and [file2] based on the file extension. For xls files, it will execute the script diff-xls.js using wscript, which will open the two files for analysis without any macro security warning. An attacker can exploit this by putting a macro virus in a network drive, and force the victim to open the workbooks and execute the macro inside.

Remediation

Install update from vendor's website.

References

• http://seclists.org/fulldisclosure/2019/Aug/7
• https://www.vulnerability-lab.com/get_content.php?id=2188