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9a69c24150
This fixes a side-channel attack on the (fortunately unused!) BridgePassword option for bridge authorities. Fix for bug 5543; bugfix on 0.2.0.14-alpha.
12 lines
602 B
Plaintext
12 lines
602 B
Plaintext
o Security fixes:
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- When using the debuging BridgePassword field, a bridge authority
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now compares alleged passwords by hashing them, then comparing
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the result to a digest of the expected authenticator. This avoids
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a potential side-channel attack in the previous code, which
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had foolishly used strcmp(). Fortunately, the BridgePassword field
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*is not in use*, but if it had been, the timing
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behavior of strcmp() might have allowed an adversary to guess the
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BridgePassword value, and enumerate the bridges. Bugfix on
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0.2.0.14-alpha. Fixes bug 5543.
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