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Google developers have confirmed a cryptographic vulnerability in the Android operating system that researchers say could generate serious security glitches on hundreds of thousands of end user apps, many of them used to make Bitcoin transactions.
This weakness in Android's Java Cryptography Architecture is the root cause of a Bitcoin transaction that reportedly was exploited to pilfer about $5,720 worth of bitcoins out of a digital wallet last week. The disclosure, included in a blog post published Wednesday by Google security engineer Alex Klyubin, was the first official confirmation of the Android vulnerability since Ars and others reported the incident last weekend. Klyubin warned that other apps might also be compromised unless developers change the way they access so-called PRNGs, short for pseudo random number generators.
"We have now determined that applications which use the Java Cryptography Architecture (JCA) for key generation, signing, or random number generation may not receive cryptographically strong values on Android devices due to improper initialization of the underlying PRNG," he wrote. "Applications that directly invoke the system-provided OpenSSL PRNG without explicit initialization on Android are also affected." Apps that establish encrypted connections using the HttpClient and java.net classes aren't vulnerable.Google Android Confirms Java Cryptography Architecture Flaw [arstechnica.com]
Developers who use JCA for key generation, signing or random number generation should update their applications to explicitly initialize the PRNG with entropy from /dev/urandom or /dev/random.The Android security team has been investigating the root cause of the compromise of a bitcoin transaction that led to the update of multiple Bitcoin applications on August 11. [android-developers.blogspot.com]
Also, developers should evaluate whether to regenerate cryptographic keys or other random values previously generated using JCA APIs such as SecureRandom, KeyGenerator, KeyPairGenerator, KeyAgreement, and Signature.
In addition to this developer recommendation, Android has developed patches that ensure that Androidís OpenSSL PRNG is initialized correctly. Those patches have been provided to OHA partners.