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    CVE-2016-2167

    The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.

    Published:Apr 28, 2016
    Last Modified:Apr 12, 2025
    EPS:May 5, 2016
    EPSS Score:0.0039
    CVSS Score:6.8

    Affected Products

    Vendor
    Apache
    Product
    Subversion

    Exploits

    No exploit reference

    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-19 Embedding Scripts within Scripts
    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-441 Malicious Logic Insertion
    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-478 Modification of Windows Service Configuration
    CAPEC-479 Malicious Root Certificate
    CAPEC-502 Intent Spoof
    CAPEC-503 WebView Exposure
    CAPEC-52 Embedding NULL Bytes
    CAPEC-53 Postfix, Null Terminate, and Backslash
    CAPEC-536 Data Injected During Configuration
    CAPEC-546 Incomplete Data Deletion in a Multi-Tenant Environment
    CAPEC-550 Install New Service
    CAPEC-551 Modify Existing Service
    CAPEC-552 Install Rootkit
    CAPEC-556 Replace File Extension Handlers
    CAPEC-558 Replace Trusted Executable
    CAPEC-562 Modify Shared File
    CAPEC-563 Add Malicious File to Shared Webroot
    CAPEC-564 Run Software at Logon
    CAPEC-578 Disable Security Software
    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-2024-46901 (CVSS 3.1) — Insufficient validation of filenames against control characters in Apache Subversion repositories served via m…
    CVE-2024-45720 (CVSS 8.2) — On Windows platforms, a "best fit" character encoding conversion of command line arguments to Subversion's exe…
    CVE-2021-28544 (CVSS 4.3) — Apache Subversion SVN authz protected copyfrom paths regression Subversion servers reveal 'copyfrom' paths tha…
    CVE-2022-24070 (CVSS 7.5) — Subversion's mod_dav_svn is vulnerable to memory corruption. While looking up path-based authorization rules, …
    CVE-2020-17525 (CVSS 7.5) — Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSV…
    CVE-2019-0203 (CVSS 7.5) — In Apache Subversion versions up to and including 1.9.10, 1.10.4, 1.12.0, Subversion's svnserve server process…
    CVE-2018-11782 (CVSS 6.5) — In Apache Subversion versions up to and including 1.9.10, 1.10.4, 1.12.0, Subversion's svnserve server process…
    CVE-2018-11803 (CVSS 7.5) — Subversion's mod_dav_svn Apache HTTPD module versions 1.11.0 and 1.10.0 to 1.10.3 will crash after dereferenci…
    CVE-2017-9800 (CVSS 9.8) — A maliciously constructed svn+ssh:// URL would cause Subversion clients before 1.8.19, 1.9.x before 1.9.7, and…
    CVE-2016-8734 (CVSS 6.5) — Apache Subversion's mod_dontdothat module and HTTP clients 1.4.0 through 1.8.16, and 1.9.0 through 1.9.4 are v…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
    http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA%40mail.gmail.com%3E
    http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ%40mail.gmail.com%3E
    http://subversion.apache.org/security/CVE-2016-2167-advisory.txt
    http://www.debian.org/security/2016/dsa-3561
    http://www.securityfocus.com/bid/89417
    http://www.securitytracker.com/id/1035706
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
    https://security.gentoo.org/glsa/201610-05
    https://www.oracle.com/security-alerts/cpuoct2020.html
    http://lists.fedoraproject.org/pipermail/package-announce/2016-May/184545.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00043.html
    http://lists.opensuse.org/opensuse-updates/2016-05/msg00044.html
    http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgJet+7_MAhomFVOXPgLtewcUw9w=k9zdPCkq5tvPxVMA%40mail.gmail.com%3E
    http://mail-archives.apache.org/mod_mbox/subversion-announce/201604.mbox/%3CCAP_GPNgfn1iKueW51EpmXzXi_URNfGNofZSgOyW1_jnSeNm5DQ%40mail.gmail.com%3E
    http://subversion.apache.org/security/CVE-2016-2167-advisory.txt
    http://www.debian.org/security/2016/dsa-3561
    http://www.securityfocus.com/bid/89417
    http://www.securitytracker.com/id/1035706
    http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.417496
    https://security.gentoo.org/glsa/201610-05
    https://www.oracle.com/security-alerts/cpuoct2020.html

    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