Tor before 0.2.1.22, and 0.2.2.x before 0.2.2.7-alpha, when functioning as a bridge directory authority, allows remote attackers to obtain sensitive information about bridge identities and bridge descriptors via a dbg-stability.txt directory query.
References to Advisories, Solutions, and Tools
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[or-talk] 20100120 Tor 0.2.2.7-alpha is out
[or-announce] 20100121 Tor 0.2.1.22 is released (security fix)