Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack given malicious input with excessive recursion. This could result in a Denial Of Service attack. There are no such structures used within SSL/TLS that come from untrusted sources so this is considered safe. Fixed in OpenSSL 1.1.0h (Affected 1.1.0-1.1.0g). Fixed in OpenSSL 1.0.2o (Affected 1.0.2b-1.0.2n).
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2018-0739 from the MITRE CVE dictionary dictionary and NIST NVD.
| 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 | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (openssl) | RHSA-2018:3221 | 2018-10-30 |
| Red Hat Enterprise Linux 7 (ovmf) | RHSA-2018:3090 | 2018-10-30 |
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss Web Server 3 | openssl | Affected |
| Red Hat JBoss EWS 2 | openssl | Will not fix |
| Red Hat JBoss EAP 6 | openssl | Will not fix |
| Red Hat JBoss EAP 5 | openssl | Will not fix |
| Red Hat JBoss Core Services 1 | openssl | Affected |
| Red Hat Enterprise Linux 7 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 7 | OVMF | Affected |
| Red Hat Enterprise Linux 6 | openssl | Will not fix |
| Red Hat Enterprise Linux 6 | openssl098e | Will not fix |
| Red Hat Enterprise Linux 5 | openssl | Affected |
| Red Hat Enterprise Linux 5 | openssl097a | Affected |
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