XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2017-9233 from the MITRE CVE dictionary dictionary and NIST NVD.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 6.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | Required |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss EWS 2 | httpd | Will not fix |
| Red Hat JBoss EAP 6 | httpd | Will not fix |
| Red Hat Enterprise Linux 7 | xulrunner | Will not fix |
| Red Hat Enterprise Linux 7 | firefox | Will not fix |
| Red Hat Enterprise Linux 7 | expat | Will not fix |
| Red Hat Enterprise Linux 7 | thunderbird | Will not fix |
| Red Hat Enterprise Linux 6 | firefox | Will not fix |
| Red Hat Enterprise Linux 6 | thunderbird | Will not fix |
| Red Hat Enterprise Linux 6 | xulrunner | Will not fix |
| Red Hat Enterprise Linux 6 | compat-expat1 | Will not fix |
| Red Hat Enterprise Linux 5 | thunderbird | Will not fix |
| Red Hat Enterprise Linux 5 | expat | Will not fix |
| Red Hat Enterprise Linux 5 | xmlrpc-c | Will not fix |
| Red Hat Enterprise Linux 5 | firefox | Will not fix |
| Red Hat Enterprise Linux 5 | xulrunner | Will not fix |
| RHEV Manager 3 | mingw-virt-viewer | Will not fix |
Do not parse untrusted arbitrary XML data using the expat package.
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