CVE:CVE-2011-0490
CNNVD:CNNVD-201101-225
Tor（The Onion Router）是第二代洋葱路由（onion routing）的一种实现，主要用于匿名访问互联网。
Tor 0.2.1.29之前版本和0.2.2.21-alpha之前的0.2.2.x版本在Libevent日志处理器中对Libevent进行通话。远程攻击者可以借助能够触发某些日志消息的向量导致拒绝服务(守护进程崩溃)。
solution:Upgrade tor tor to a higher version than 0.2.1.28,0.0.2,0.0.2_pre13,0.0.2_pre14,0.0.2_pre15,0.0.2_pre16,0.0.2_pre17,0.0.2_pre18,0.0.2_pre19,0.0.2_pre20,0.0.2_pre21,0.0.2_pre22,0.0.2_pre23,0.0.2_pre24,0.0.2_pre25,0.0.2_pre26,0.0.2_pre27,0.0.3,0.0.4,0.0.5,0.0.6,0.0.6.1,0.0.6.2,0.0.7,0.0.7.1,0.0.7.2,0.0.7.3,0.0.8,0.0.8.1,0.0.9,0.0.9.1,0.0.9.2,0.0.9.3,0.0.9.4,0.0.9.5,0.0.9.6,0.0.9.7,0.0.9.8,0.0.9.9,0.0.9.10,0.1.0.1,0.1.0.2,0.1.0.3,0.1.0.4,0.1.0.5,0.1.0.6,0.1.0.7,0.1.0.8,0.1.0.9,0.1.0.10,0.1.0.11,0.1.0.12,0.1.0.13,0.1.0.14,0.1.0.15,0.1.0.16,0.1.0.17,0.1.1,0.1.1.1,0.1.1.1:alpha,0.1.1.2,0.1.1.2:alpha,0.1.1.3,0.1.1.3:alpha,0.1.1.4,0.1.1.4:alpha,0.1.1.5,0.1.1.5:alpha,0.1.1.6,0.1.1.6:alpha,0.1.1.7,0.1.1.7:alpha,0.1.1.8,0.1.1.8:alpha,0.1.1.9,0.1.1.9:alpha,0.1.1.10,0.1.1.10:alpha,0.1.1.11,0.1.1.12,0.1.1.13,0.1.1.14,0.1.1.15,0.1.1.16,0.1.1.17,0.1.1.18,0.1.1.19,0.1.1.20,0.1.1.21,0.1.1.22,0.1.1.23,0.1.1.25,0.1.1.26,0.1.2.1:alpha-cvs,0.1.2.2,0.1.2.3:alpha,0.1.2.4,0.1.2.5,0.1.2.5:alpha,0.1.2.6:alpha,0.1.2.7:alpha,0.1.2.8:beta,0.1.2.9,0.1.2.10,0.1.2.11,0.1.2.12,0.1.2.13,0.1.2.14,0.1.2.15,0.1.2.16,0.1.2.17,0.1.2.18,0.1.2.19,0.1.2.30,0.1.2.31,0.2.0.1:alpha,0.2.0.2:alpha,0.2.0.3:alpha,0.2.0.4:alpha,0.2.0.5:alpha,0.2.0.6:alpha,0.2.0.7:alpha,0.2.0.8:alpha,0.2.0.9:alpha,0.2.0.10:alpha,0.2.0.11:alpha,0.2.0.12:alpha,0.2.0.13:alpha,0.2.0.14:alpha,0.2.0.15:alpha,0.2.0.16:alpha,0.2.0.17:alpha,0.2.0.18:alpha,0.2.0.19:alpha,0.2.0.20:alpha,0.2.0.21:alpha,0.2.0.22:alpha,0.2.0.23:alpha,0.2.0.24:alpha,0.2.0.25:alpha,0.2.0.26:alpha,0.2.0.27:alpha,0.2.0.28:alpha,0.2.0.29,0.2.0.29:alpha,0.2.0.30,0.2.0.30:alpha,0.2.0.31,0.2.0.31:alpha,0.2.0.32:alpha,0.2.0.33,0.2.0.34:alpha,0.2.0.35,0.2.1.1:alpha,0.2.1.2:alpha,0.2.1.3:alpha,0.2.1.4:alpha,0.2.1.5:alpha,0.2.1.6:alpha,0.2.1.7:alpha,0.2.1.8:alpha,0.2.1.9:alpha,0.2.1.10:alpha,0.2.1.11:alpha,0.2.1.12,0.2.1.12:alpha,0.2.1.13,0.2.1.14,0.2.1.15,0.2.1.16,0.2.1.17,0.2.1.18,0.2.1.19,0.2.1.20,0.2.1.21,0.2.1.22,0.2.1.23,0.2.1.24,0.2.1.25,0.2.1.26,0.2.1.27,0.2.2.1,0.2.2.1:alpha,0.2.2.2,0.2.2.2:alpha,0.2.2.3,0.2.2.3:alpha,0.2.2.4,0.2.2.4:alpha,0.2.2.5,0.2.2.5:alpha,0.2.2.6,0.2.2.6:alpha,0.2.2.7:alpha,0.2.2.8:alpha,0.2.2.9:alpha,0.2.2.10:alpha,0.2.2.11:alpha,0.2.2.12:alpha,0.2.2.13:alpha,0.2.2.14:alpha,0.2.2.15:alpha,0.2.2.16:alpha,0.2.2.17:alpha,0.2.2.18:alpha,0.2.2.19:alpha,0.2.2.20:alpha,and avoid the version (,0.2.1.28],0.0.2,0.0.2_pre13,0.0.2_pre14,0.0.2_pre15,0.0.2_pre16,0.0.2_pre17,0.0.2_pre18,0.0.2_pre19,0.0.2_pre20,0.0.2_pre21,0.0.2_pre22,0.0.2_pre23,0.0.2_pre24,0.0.2_pre25,0.0.2_pre26,0.0.2_pre27,0.0.3,0.0.4,0.0.5,0.0.6,0.0.6.1,0.0.6.2,0.0.7,0.0.7.1,0.0.7.2,0.0.7.3,0.0.8,0.0.8.1,0.0.9,0.0.9.1,0.0.9.2,0.0.9.3,0.0.9.4,0.0.9.5,0.0.9.6,0.0.9.7,0.0.9.8,0.0.9.9,0.0.9.10,0.1.0.1,0.1.0.2,0.1.0.3,0.1.0.4,0.1.0.5,0.1.0.6,0.1.0.7,0.1.0.8,0.1.0.9,0.1.0.10,0.1.0.11,0.1.0.12,0.1.0.13,0.1.0.14,0.1.0.15,0.1.0.16,0.1.0.17,0.1.1,0.1.1.1,0.1.1.1:alpha,0.1.1.2,0.1.1.2:alpha,0.1.1.3,0.1.1.3:alpha,0.1.1.4,0.1.1.4:alpha,0.1.1.5,0.1.1.5:alpha,0.1.1.6,0.1.1.6:alpha,0.1.1.7,0.1.1.7:alpha,0.1.1.8,0.1.1.8:alpha,0.1.1.9,0.1.1.9:alpha,0.1.1.10,0.1.1.10:alpha,0.1.1.11,0.1.1.12,0.1.1.13,0.1.1.14,0.1.1.15,0.1.1.16,0.1.1.17,0.1.1.18,0.1.1.19,0.1.1.20,0.1.1.21,0.1.1.22,0.1.1.23,0.1.1.25,0.1.1.26,0.1.2.1:alpha-cvs,0.1.2.2,0.1.2.3:alpha,0.1.2.4,0.1.2.5,0.1.2.5:alpha,0.1.2.6:alpha,0.1.2.7:alpha,0.1.2.8:beta,0.1.2.9,0.1.2.10,0.1.2.11,0.1.2.12,0.1.2.13,0.1.2.14,0.1.2.15,0.1.2.16,0.1.2.17,0.1.2.18,0.1.2.19,0.1.2.30,0.1.2.31,0.2.0.1:alpha,0.2.0.2:alpha,0.2.0.3:alpha,0.2.0.4:alpha,0.2.0.5:alpha,0.2.0.6:alpha,0.2.0.7:alpha,0.2.0.8:alpha,0.2.0.9:alpha,0.2.0.10:alpha,0.2.0.11:alpha,0.2.0.12:alpha,0.2.0.13:alpha,0.2.0.14:alpha,0.2.0.15:alpha,0.2.0.16:alpha,0.2.0.17:alpha,0.2.0.18:alpha,0.2.0.19:alpha,0.2.0.20:alpha,0.2.0.21:alpha,0.2.0.22:alpha,0.2.0.23:alpha,0.2.0.24:alpha,0.2.0.25:alpha,0.2.0.26:alpha,0.2.0.27:alpha,0.2.0.28:alpha,0.2.0.29,0.2.0.29:alpha,0.2.0.30,0.2.0.30:alpha,0.2.0.31,0.2.0.31:alpha,0.2.0.32:alpha,0.2.0.33,0.2.0.34:alpha,0.2.0.35,0.2.1.1:alpha,0.2.1.2:alpha,0.2.1.3:alpha,0.2.1.4:alpha,0.2.1.5:alpha,0.2.1.6:alpha,0.2.1.7:alpha,0.2.1.8:alpha,0.2.1.9:alpha,0.2.1.10:alpha,0.2.1.11:alpha,0.2.1.12,0.2.1.12:alpha,0.2.1.13,0.2.1.14,0.2.1.15,0.2.1.16,0.2.1.17,0.2.1.18,0.2.1.19,0.2.1.20,0.2.1.21,0.2.1.22,0.2.1.23,0.2.1.24,0.2.1.25,0.2.1.26,0.2.1.27,0.2.2.1,0.2.2.1:alpha,0.2.2.2,0.2.2.2:alpha,0.2.2.3,0.2.2.3:alpha,0.2.2.4,0.2.2.4:alpha,0.2.2.5,0.2.2.5:alpha,0.2.2.6,0.2.2.6:alpha,0.2.2.7:alpha,0.2.2.8:alpha,0.2.2.9:alpha,0.2.2.10:alpha,0.2.2.11:alpha,0.2.2.12:alpha,0.2.2.13:alpha,0.2.2.14:alpha,0.2.2.15:alpha,0.2.2.16:alpha,0.2.2.17:alpha,0.2.2.18:alpha,0.2.2.19:alpha,0.2.2.20:alpha