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libevent dns remote stack overread vulnerability #317

asn-d6 opened this issue Jan 27, 2016 · 2 comments


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commented Jan 27, 2016


the name_parse() function in libevent's DNS code is vulnerable to a buffer overread.

971         if (cp != name_out) {
972             if (cp + 1 >= end) return -1;
973             *cp++ = '.';
974         }
975         if (cp + label_len >= end) return -1;
976         memcpy(cp, packet + j, label_len);
977         cp += label_len;
978         j += label_len;

No check is made against length before the memcpy occurs.

This was found through the Tor bug bounty program and the discovery should be credited to 'Guido Vranken'.

@azat azat self-assigned this Feb 1, 2016

@azat azat closed this in 96f64a0 Feb 1, 2016


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commented Feb 1, 2016


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commented Feb 2, 2017

This was assigned CVE-2016-10195:

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