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    CVE-2012-4922

    The tor_timegm function in common/util.c in Tor before 0.2.2.39, and 0.2.3.x before 0.2.3.22-rc, does not properly validate time values, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a malformed directory object, a different vulnerability than CVE-2012-4419.

    Published:Sep 14, 2012
    Last Modified:Apr 11, 2025
    EPS:Sep 14, 2012
    EPSS Score:0.05586
    CVSS Score:5

    Affected Products

    Vendor
    Torproject
    Product
    Tor

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-20 Improper Input Validation

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-10 Buffer Overflow via Environment Variables
    CAPEC-101 Server Side Include (SSI) Injection
    CAPEC-104 Cross Zone Scripting
    CAPEC-108 Command Line Execution through SQL Injection
    CAPEC-109 Object Relational Mapping Injection
    CAPEC-110 SQL Injection through SOAP Parameter Tampering
    CAPEC-120 Double Encoding
    CAPEC-13 Subverting Environment Variable Values
    CAPEC-135 Format String Injection
    CAPEC-136 LDAP Injection
    CAPEC-14 Client-side Injection-induced Buffer Overflow
    CAPEC-153 Input Data Manipulation
    CAPEC-182 Flash Injection
    CAPEC-209 XSS Using MIME Type Mismatch
    CAPEC-22 Exploiting Trust in Client
    CAPEC-23 File Content Injection
    CAPEC-230 Serialized Data with Nested Payloads
    CAPEC-231 Oversized Serialized Data Payloads
    CAPEC-24 Filter Failure through Buffer Overflow
    CAPEC-250 XML Injection
    CAPEC-261 Fuzzing for garnering other adjacent user/sensitive data
    CAPEC-267 Leverage Alternate Encoding
    CAPEC-28 Fuzzing
    CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters
    CAPEC-31 Accessing/Intercepting/Modifying HTTP Cookies
    CAPEC-42 MIME Conversion
    CAPEC-43 Exploiting Multiple Input Interpretation Layers
    CAPEC-45 Buffer Overflow via Symbolic Links
    CAPEC-46 Overflow Variables and Tags
    CAPEC-47 Buffer Overflow via Parameter Expansion
    CAPEC-473 Signature Spoof
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-588 DOM-Based XSS
    CAPEC-63 Cross-Site Scripting (XSS)
    CAPEC-64 Using Slashes and URL Encoding Combined to Bypass Validation Logic
    CAPEC-664 Server Side Request Forgery
    CAPEC-67 String Format Overflow in syslog()
    CAPEC-7 Blind SQL Injection
    CAPEC-71 Using Unicode Encoding to Bypass Validation Logic
    CAPEC-72 URL Encoding
    CAPEC-73 User-Controlled Filename
    CAPEC-78 Using Escaped Slashes in Alternate Encoding
    CAPEC-79 Using Slashes in Alternate Encoding
    CAPEC-8 Buffer Overflow in an API Call
    CAPEC-80 Using UTF-8 Encoding to Bypass Validation Logic
    CAPEC-81 Web Server Logs Tampering
    CAPEC-83 XPath Injection
    CAPEC-85 AJAX Footprinting
    CAPEC-88 OS Command Injection
    CAPEC-9 Buffer Overflow in Local Command-Line Utilities

    Related CVEs

    CVE-2026-87724 (CVSS 6.5) — Tor before 0.4.9.12 interprets the CC_RESPONSE extension even when CC_REQUEST was not sent, which allows remot…
    CVE-2026-77642 (CVSS 7.5) — tor before 0.4.9.9 was prone to an out-of-bounds write when parsing a consensus or detached signature with un…
    CVE-2026-77641 (CVSS 6.5) — tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return v…
    CVE-2026-77640 (CVSS 3.7) — tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip stream with done=1.…
    CVE-2026-77639 (CVSS 5.3) — Tor before 0.4.9.9 was prone to a compression bomb bypass where an attacker could concatenate many gzip or zli…
    CVE-2026-77638 (CVSS 8.9) — Tor before 0.4.9.11 is prone to a race condition where in just the right circumstances a rendezvous point coul…
    CVE-2026-77587 (CVSS 5.9) — Tor before 0.4.9.11 is prone to a use-after-free (and potential double free) of a conflux object when a recove…
    CVE-2026-77584 (CVSS 7) — Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached st…
    CVE-2026-44603 (CVSS 3.7) — Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.…
    CVE-2026-44602 (CVSS 3.7) — Tor before 0.4.9.7 has a NULL pointer dereference when a CERT cell is received out of order, aka TROVE-2026-00…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088006.html
    http://lists.opensuse.org/opensuse-updates/2012-10/msg00005.html
    http://openwall.com/lists/oss-security/2012/09/12/5
    http://security.gentoo.org/glsa/glsa-201301-03.xml
    https://gitweb.torproject.org/tor.git/blob/release-0.2.2:/ReleaseNotes
    https://gitweb.torproject.org/tor.git/commit/973c18bf0e84d14d8006a9ae97fde7f7fb97e404
    https://lists.torproject.org/pipermail/tor-talk/2012-September/025501.html
    https://trac.torproject.org/projects/tor/ticket/6811
    http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088006.html
    http://lists.opensuse.org/opensuse-updates/2012-10/msg00005.html
    http://openwall.com/lists/oss-security/2012/09/12/5
    http://security.gentoo.org/glsa/glsa-201301-03.xml
    https://gitweb.torproject.org/tor.git/blob/release-0.2.2:/ReleaseNotes
    https://gitweb.torproject.org/tor.git/commit/973c18bf0e84d14d8006a9ae97fde7f7fb97e404
    https://lists.torproject.org/pipermail/tor-talk/2012-September/025501.html
    https://trac.torproject.org/projects/tor/ticket/6811

    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