CVE-2023-41879

Magento LTS is the official OpenMage LTS codebase. Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack. This issue has been patched in versions 19.5.1 and 20.1.1.

Magento LTS is the official OpenMage LTS codebase. Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack. This issue has been patched in versions 19.5.1 and 20.1.1.

Impact

Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack.

Patches

None.

Workarounds

Implementing rate-limiting at the web server would help mitigate the issue. In particular, a very strict rate limit (e.g. 1 per minute per IP) for the specific route (sales/guest/view/) would effectively mitigate the issue.

References

Email from Frank Rochlitzer ([email protected]) to [email protected]:

Summary

The German Federal Office for Information Security (BSI) found the following flaw in OpenMage through a commissioned pen test: The web application was found to accept certain requests even without prior strong authentication if the person making the request has data that is non-public but also not secret, such as easily easily guessed transaction numbers or names. Attacking entities could possibly exploit this to retrieve sensitive information using this easier-to-obtain data and by trying random numbers.

Details

Customers who place an order without an account can subsequently retrieve the order data or invoice data by specifying individual information. Technically, the access is realized by specifying the cookie guest-view. The value of the cookie is Base64 encoded and contains a random value and the order number. The random value consists of six characters, where these are taken from the alphabet [0-9a-f]. In the best case, i.e. when using a cryptographically secure random number generator, this corresponds to an entropy of 24 bits. Furthermore, the order numbers are assigned incrementally, so that the number range can be narrowed down or an upper limit determined by placing an order. Specifically, this results in the risk that an attacking entity can iterate over all possible values of the cookie's random value. If successful, the billing address, shipping address, payment details and the ordered items can be viewed. The attack only works for orders made as a guest.

PoC

The request/response pair shows the retrieval of an order. It should be noted in particular, that the cookie is not bound to a session. The response has been formatted for formatted for readability.

Request:

1 GET /magento19/index.php/default/sales/guest/view/ HTTP/1.1
2 Host: localhost.local
3 Cookie: guest-view=MzYyYzI4OjEwMDAwMDQzMQ%3D%3D;
4 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
5 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
6 Accept-Language: en-US,en;q=0.5
7 Accept-Encoding: gzip, deflate
8 Referer: https://localhost.local/magento19/index.php/default/egovs_checkout/multipage/successview/
9 Upgrade-Insecure-Requests: 1
10 Sec-Fetch-Dest: document
11 Sec-Fetch-Mode: navigate
12 Sec-Fetch-Site: same-origin
13 Sec-Fetch-User: ?1
14 Te: trailers
15 Connection: close

Response:

1 HTTP/1.1 200 OK
2 Date: Tue, 13 Dec 2022 14:06:13 GMT
3 Server: Apache
4 Strict-Transport-Security: max-age=31536000; includeSubDomains
5 X-Powered-By: PHP/7.4.6
6 Set-Cookie: om_frontend=id7v84a05u8mm1j32t2kj5rbjl; expires=Tue, 13-Dec-2022 15:06:13 GMT; Max-Age=3600; path=/magento19/; domain=localhost.local; secure; HttpOnly
7 Expires: Thu, 19 Nov 1981 08:52:00 GMT
8 Cache-Control: no-store, no-cache, must-revalidate
9 Pragma: no-cache
10 Set-Cookie: om_frontend=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/magento19/; domain=localhost.local; secure; HttpOnly; SameSite=None
11 Set-Cookie: om_frontend=o42vttknheaj0sr3q0381jipdp; expires=Tue, 13-Dec-2022 15:06:13 GMT; Max-Age=3600; path=/magento19/; domain=localhost.local; secure; HttpOnly
12 Set-Cookie: guest-view=MzYyYzI4OjEwMDAwMDQzMQ%3D%3D; expires=Tue, 13-Dec-2022 14:16:13 GMT; Max-Age=600; path=/; domain=localhost.local; secure; HttpOnly;…

Magento LTS is the official OpenMage LTS codebase. Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack. This issue has been patched in versions 19.5.1 and 20.1.1.

Magento LTS is the official OpenMage LTS codebase. Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack. This issue has been patched in versions 19.5.1 and 20.1.1.

Impact

Guest orders may be viewed without authentication using a "guest-view" cookie which contains the order's "protect_code". This code is 6 hexadecimal characters which is arguably not enough to prevent a brute-force attack. Exposing each order would require a separate brute force attack.

Patches

None.

Workarounds

Implementing rate-limiting at the web server would help mitigate the issue. In particular, a very strict rate limit (e.g. 1 per minute per IP) for the specific route (sales/guest/view/) would effectively mitigate the issue.

References

Email from Frank Rochlitzer ([email protected]) to [email protected]:

Summary

The German Federal Office for Information Security (BSI) found the following flaw in OpenMage through a commissioned pen test: The web application was found to accept certain requests even without prior strong authentication if the person making the request has data that is non-public but also not secret, such as easily easily guessed transaction numbers or names. Attacking entities could possibly exploit this to retrieve sensitive information using this easier-to-obtain data and by trying random numbers.

Details

Customers who place an order without an account can subsequently retrieve the order data or invoice data by specifying individual information. Technically, the access is realized by specifying the cookie guest-view. The value of the cookie is Base64 encoded and contains a random value and the order number. The random value consists of six characters, where these are taken from the alphabet [0-9a-f]. In the best case, i.e. when using a cryptographically secure random number generator, this corresponds to an entropy of 24 bits. Furthermore, the order numbers are assigned incrementally, so that the number range can be narrowed down or an upper limit determined by placing an order. Specifically, this results in the risk that an attacking entity can iterate over all possible values of the cookie's random value. If successful, the billing address, shipping address, payment details and the ordered items can be viewed. The attack only works for orders made as a guest.

PoC

The request/response pair shows the retrieval of an order. It should be noted in particular, that the cookie is not bound to a session. The response has been formatted for formatted for readability.

Request:

1 GET /magento19/index.php/default/sales/guest/view/ HTTP/1.1
2 Host: localhost.local
3 Cookie: guest-view=MzYyYzI4OjEwMDAwMDQzMQ%3D%3D;
4 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
5 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
6 Accept-Language: en-US,en;q=0.5
7 Accept-Encoding: gzip, deflate
8 Referer: https://localhost.local/magento19/index.php/default/egovs_checkout/multipage/successview/
9 Upgrade-Insecure-Requests: 1
10 Sec-Fetch-Dest: document
11 Sec-Fetch-Mode: navigate
12 Sec-Fetch-Site: same-origin
13 Sec-Fetch-User: ?1
14 Te: trailers
15 Connection: close

Response:

1 HTTP/1.1 200 OK
2 Date: Tue, 13 Dec 2022 14:06:13 GMT
3 Server: Apache
4 Strict-Transport-Security: max-age=31536000; includeSubDomains
5 X-Powered-By: PHP/7.4.6
6 Set-Cookie: om_frontend=id7v84a05u8mm1j32t2kj5rbjl; expires=Tue, 13-Dec-2022 15:06:13 GMT; Max-Age=3600; path=/magento19/; domain=localhost.local; secure; HttpOnly
7 Expires: Thu, 19 Nov 1981 08:52:00 GMT
8 Cache-Control: no-store, no-cache, must-revalidate
9 Pragma: no-cache
10 Set-Cookie: om_frontend=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT; Max-Age=0; path=/magento19/; domain=localhost.local; secure; HttpOnly; SameSite=None
11 Set-Cookie: om_frontend=o42vttknheaj0sr3q0381jipdp; expires=Tue, 13-Dec-2022 15:06:13 GMT; Max-Age=3600; path=/magento19/; domain=localhost.local; secure; HttpOnly
12 Set-Cookie: guest-view=MzYyYzI4OjEwMDAwMDQzMQ%3D%3D; expires=Tue, 13-Dec-2022 14:16:13 GMT; Max-Age=600; path=/; domain=localhost.local; secure; HttpOnly;…