libssl1.0.0: Constructed ASN.1 types with a recursive definition (such as can be found in PKCS7) could eventually exceed the stack...
CVE-2018-0739 is fixed in 4 products on 1 platform, first by libssl1.0.0 1.0.2n-1ubuntu5, released March 26, 2018. It is not reported as exploited. Patch Radar priority: Routine.
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).
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssl1.0.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5 | libssl1.0.0 1.0.2n-1ubuntu5 | Mar 26, 2018 |
| libssl1.1 · Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu3 | libssl1.1 1.1.0g-2ubuntu3 | Mar 26, 2018 |
| openssl · Ubuntu 18.04.6 LTS (bionic) | 1.1.0g-2ubuntu3 | openssl 1.1.0g-2ubuntu3 | Mar 26, 2018 |
| openssl1.0 · Ubuntu 18.04.6 LTS (bionic) | 1.0.2n-1ubuntu5 | openssl1.0 1.0.2n-1ubuntu5 | Mar 26, 2018 |
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