CVE-2016-4028 describes a padding oracle vulnerability in Open-Xchange OX Guard versions prior to 2.4.0-rev8. The OX Guard API's differing error responses to invalid encryption padding, when combined with AES-CBC, allows attackers to deduce the correct padding. This vulnerability enables brute-force attacks on guest authentication tokens, potentially exposing user credentials. The vulnerability has a CVSS v3 score of 7.5 (HIGH), indicating a high impact on confidentiality, integrity, and availability, with a network attack vector and high attack complexity. Successful exploitation requires a logged-in guest user and knowledge of their "OxReaderID" cookie and "auth" parameter. There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB. Community discussion and media coverage for this CVE are minimal, suggesting low public awareness or interest.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 2.4.0CPE matchmatch criteria | cpe:2.3:a:open-xchange:ox_guard:*:rev7:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.