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Revive Adserver Security Advisory                     REVIVE-SA-2020-001
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https://www.revive-adserver.com/security/revive-sa-2020-001
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CVE-IDs:               t.b.a.
Date:                  2020-01-21
Risk Level:            Low
Applications affected: Revive Adserver
Versions affected:     <= 5.0.3
Versions not affected: >= 5.0.4
Website:               https://www.revive-adserver.com/
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Vulnerability - Reflected XSS
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Vulnerability Type:    Improper Neutralization of Input During Web Page
                       Generation ('Cross-site Scripting') [CWE-79]
CVE-ID:                t.b.a.
CVSS Base Score:       4.3
CVSSv3.1 Vector:       AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS Impact Subscore:  1.4
CVSS Exploitability Subscore: 2.8
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Description
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A reflected XSS vulnerability has been discovered in the publicly
accessible afr.php delivery script of Revive Adserver by Jacopo Tediosi.
There are currently no known exploits: the session identifier cannot
be accessed as it is stored in an http-only cookie as of v3.2.2. On
older versions, however, under specific circumstances, it could be
possible to steal the session identifier and gain access to the admin
interface.

Details
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The query string sent to the www/delivery/afr.php script was printed
back without proper escaping in a JavaScript context, allowing an
attacker to execute arbitrary JS code on the browser of the victim.


References
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https://hackerone.com/reports/775693
https://github.com/revive-adserver/revive-adserver/commit/327aaf10
https://github.com/revive-adserver/revive-adserver/commit/9ec2fa26
https://cwe.mitre.org/data/definitions/79.html



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Solution
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We strongly advise people to upgrade to the most recent 5.0.4 version of
Revive Adserver.


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Contact Information
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The security contact for Revive Adserver can be reached at:
<security AT revive-adserver DOT com>.

Please review https://www.revive-adserver.com/security/ before doing so.


-- 
Matteo Beccati
On behalf of the Revive Adserver Team
https://www.revive-adserver.com/