Multiple vulnerabilities in Bitrix CMS

1) Stored cross-site scripting

EUVDB-ID: #VU6142

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in "/bitrix/admin/adv_contract_edit.php" script. A remote attacker with access to "Advertising and banners" module can create a contract with specially crafted name and permanently store HTML and JavaScript code in database. The code will be executed in another user's browser in context of vulnerable website the the affected contract is viewed.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update "Advertising and banners" module to the latest version 17.0.0.

Vulnerable software versions

Bitrix Site Manager: 16.0 - 16.5

External links

http://www.1c-bitrix.ru/products/cms/versions.php?module=advertising

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Stored cross-site scripting

EUVDB-ID: #VU6145

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in "/bitrix/admin/adv_banner_edit.php" script when processing "NOT_SHOW_PAGE" and "SHOW_PAGE" HTTP POST parameters. A remote attacker with access to "Advertising and banners" module can create or edit a banner and permanently store HTML and JavaScript code in database. The code will be executed in another user's browser in context of vulnerable website the the affected contract is viewed.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update "Advertising and banners" module to the latest version 17.0.0.

Vulnerable software versions

Bitrix Site Manager: 16.0 - 16.5

External links

http://www.1c-bitrix.ru/products/cms/versions.php?module=advertising

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Directory traversal

EUVDB-ID: #VU6146

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to overwrite arbitrary files on vulnerable system.

The vulnerability exists in "makeFileArrayFromArray()" function in "/bitrix/modules/advertising/classes/general/advertising.php" when processing file uploads. A remote authenticated attacker with access to "Advertising and banners" module can upload arbitrary file on the target system with specially crafted filename, containing directory traversal sequences (e.g. ../) and overwrite certain files on vulnerable system outside the web root directory.

Mitigation

Update "Advertising and banners" module to the latest version 17.0.0.

Vulnerable software versions

Bitrix Site Manager: 16.0 - 16.5

External links

http://www.1c-bitrix.ru/products/cms/versions.php?module=advertising

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.