The TLS stack in Mono before 3.12.1 allows man-in-the-middle attackers to conduct message skipping attacks and consequently impersonate clients by leveraging missing handshake state validation, aka a SMACK SKIP-TLS issue.
Weakness
The product does not validate, or incorrectly validates, a certificate.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mono | Mono-project | * | 3.12.1 (excluding) |
| Mono | Ubuntu | devel | * |
| Mono | Ubuntu | esm-infra-legacy/trusty | * |
| Mono | Ubuntu | lucid | * |
| Mono | Ubuntu | precise | * |
| Mono | Ubuntu | trusty | * |
| Mono | Ubuntu | trusty/esm | * |
| Mono | Ubuntu | upstream | * |
| Mono | Ubuntu | utopic | * |
Potential Mitigations
Related Attack Patterns
References
- http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
- http://www.openwall.com/lists/oss-security/2015/03/17/9
- http://www.securityfocus.com/bid/73253
- http://www.ubuntu.com/usn/USN-2547-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1202869
- https://github.com/mono/mono/commit/1509226c41d74194c146deb173e752b8d3cdeec4
- https://mitls.org/pages/attacks/SMACK#skip
- https://www.debian.org/security/2015/dsa-3202
- http://www.mono-project.com/news/2015/03/07/mono-tls-vulnerability/
- http://www.openwall.com/lists/oss-security/2015/03/17/9
- http://www.securityfocus.com/bid/73253
- http://www.ubuntu.com/usn/USN-2547-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1202869
- https://github.com/mono/mono/commit/1509226c41d74194c146deb173e752b8d3cdeec4
- https://mitls.org/pages/attacks/SMACK#skip
- https://www.debian.org/security/2015/dsa-3202