OpenSSL 1.0.1 contains a vulnerability that could disclose sensitive private information to an attacker. This vulnerability is commonly referred to as "heartbleed."
By attacking a service that uses a vulnerable version of OpenSSL, a remote, unauthenticated attacker may be able to retrieve sensitive information, such as secret keys. By leveraging this information, an attacker may be able to decrypt, spoof, or perform man-in-the-middle attacks on network traffic that would otherwise be protected by OpenSSL.
No statement is currently available from the vendor regarding this vulnerability.
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The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remote attackers to obtain sensitive information from process memory via crafted packets that trigger a buffer over-read, as demonstrated by reading private keys, related to d1_both.c and t1_lib.c, aka the Heartbleed bug.
Optional verification of results:
In 'dpkg -l | grep ssl' command output, the "libssl1.0.0" and "openssl" packages should display version "1.0.1-4ubuntu5.12" if the patch has been successfully applied.
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