CVE-2012-3519

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    CVE-2012-3519

    Published: 26 Aug 2012Last Modified: 10 Apr 2026

    Summary:

    Details: routerlist.c in Tor before 0.2.2.38 uses a different amount of time for relay-list iteration depending on which relay is chosen, which might allow remote attackers to obtain sensitive information about relay selection via a timing side-channel attack.

    References: http://secunia.com/advisories/50583, http://security.gentoo.org/glsa/glsa-201301-03.xml, http://lists.opensuse.org/opensuse-updates/2012-08/msg00048.html, http://openwall.com/lists/oss-security/2012/08/21/6, https://gitweb.torproject.org/tor.git/commit/308f6dad20675c42b29862f4269ad1fbfb00dc9a, https://gitweb.torproject.org/tor.git/commit/d48cebc5e498b0ae673635f40fc57cdddab45d5b, https://lists.torproject.org/pipermail/tor-announce/2012-August/000086.html, https://trac.torproject.org/projects/tor/ticket/6537

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High