CVE-2019-12765

published 2019-06-11

CVE-2019-12765: An issue was discovered in Joomla! before 3.9.7. The CSV export of com_actionslogs is vulnerable to CSV injection.

Priority P2 63 critical 9.8 CVSS 3.1

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

An issue was discovered in Joomla! before 3.9.7. The CSV export of com_actionslogs is vulnerable to CSV injection.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
joomla	joomla_!	3.9.0 – 3.9.6	—

Detection & IOCs extracted from sources · hover to see the quote

url http://127.0.0.1/joomla/index.php/component/users/?view=registration&Itemid=101↗

url /joomla/index.php?option=com_users↗

command =cmd|'/c calc.exe'!A1↗

• → Monitor Joomla user registration form submissions where the 'jform[name]' field contains CSV injection characters (e.g., leading '=', '+', '-', '@') followed by pipe-delimited command strings such as '=cmd|'. ↗
• → Alert on POST requests to the Joomla registration endpoint (/index.php/component/users/?view=registration) containing formula-injection patterns in name fields, indicative of CSV injection staging via com_actionslogs. ↗
• → The CSV export of com_actionslogs is the delivery vector; inspect exported CSV files or HTTP responses from com_actionslogs for cells beginning with '=', '+', '-', or '@' followed by command syntax. ↗

• · The exploit payload uses 'calc.exe' as a proof-of-concept; real-world attackers would substitute arbitrary OS commands. Detection rules should match the formula-injection prefix pattern generically (e.g., '=cmd|') rather than only the PoC payload. ↗
• · Vulnerability affects Joomla! versions before 3.9.7; instances running 3.9.7 or later with the patch applied are not susceptible via this vector. ↗

CVSS provenance

nvd v3.1 9.8 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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