2021-21345 | Oracle WebCenter Portal XStream code injection
|CVSS Meta Temp Score
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|Current Exploit Price (≈)
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|CTI Interest Score
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A vulnerability classified as very critical was found in Oracle WebCenter Portal 220.127.116.11.0/18.104.22.168.0/22.214.171.124.0 (Content Management System). Affected by this vulnerability is some unknown functionality of the component XStream. The manipulation with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-94. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:
XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker who has sufficient rights to execute commands of the host only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream’s security framework with a whitelist limited to the minimal required types. If you rely on XStream’s default blacklist of the Security Framework, you will have to use at least version 1.4.16.
The weakness was presented 07/20/2021 as Oracle Critical Patch Update Advisory – July 2021. It is possible to read the advisory at oracle.com. This vulnerability is known as CVE-2021-21345 since 12/22/2020. The exploitation appears to be easy. The attack can be launched remotely. A single authentication is required for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/24/2021).
We expect the 0-day to have been worth approximately $25k-$100k.
Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.
VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5
VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 9.9
NVD Vector: 🔒
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
NVD Base Score: 🔒
Class: Privilege escalation
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒
12/22/2020 CVE assigned
07/20/2021 +209 days Advisory disclosed
07/20/2021 +0 days Countermeasure disclosed
07/21/2021 +1 days VulDB entry created
07/24/2021 +3 days VulDB last updateVendor: https://www.oracle.com
Advisory: Oracle Critical Patch Update Advisory – July 2021
CVE: CVE-2021-21345 (🔒)
Created: 07/21/2021 10:37
Updated: 07/24/2021 05:54
Changes: (19) vulnerability_cwe vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai source_cve_cna exploit_price_0day vulnerability_cvss2_nvd_basescore vulnerability_cvss3_nvd_basescore
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