OpenSSL heartbeat information disclosure: OpenSSL versions 1.0.1 through 1.0.1f contain a flaw in its implementation of the TLS/DTLS heartbeat functionality (RFC6520). This flaw allows an attacker to retrieve private memory of an application that uses the vulnerable OpenSSL library in chunks of 64k at a time. Note that an attacker can repeatedly leverage the vulnerability to retrieve as many 64k chunks of memory as are necessary to retrieve the intended secrets. The sensitive information that may be retrieved using this vulnerability include:
- Primary key material (secret keys)
- Secondary key material (user names and passwords used by vulnerable services)
- Protected content (sensitive data used by vulnerable services)
- Collateral (memory addresses and content that can be leveraged to bypass exploit mitigations)
Please see the Heartbleed website for more details.
Exploit code for this vulnerability is publicly available.