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    CVE-2010-0433

    The kssl_keytab_is_available function in ssl/kssl.c in OpenSSL before 0.9.8n, when Kerberos is enabled but Kerberos configuration files cannot be opened, does not check a certain return value, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via SSL cipher negotiation, as demonstrated by a chroot installation of Dovecot or stunnel without Kerberos configuration files inside the chroot.

    Published:Jan 19, 2010
    Last Modified:Apr 11, 2025
    EPS:Mar 5, 2010
    EPSS Score:0.10532
    CVSS Score:4.3

    Affected Products

    Vendor
    Openssl
    Product
    Openssl
    Vendor
    Redhat
    Product
    Enterprise Linux

    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

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    CVE-2026-63075 (CVSS 7.5) — Issue summary: When OpenSSL processes QUIC traffic from a peer that repeatedly sends ack-eliciting packets whi…
    CVE-2026-63072 (CVSS 7.5) — Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based on querying the unwrapped key s…
    CVE-2026-54874 (CVSS 7.5) — Issue summary: Receiving a DTLS record for a future epoch while a handshake is in progress causes OpenSSL to b…
    CVE-2026-14457 (CVSS 7.5) — Issue summary: In a server or client configuration with RFC7250 Raw Public Keys (RPKs) enabled, and only the p…
    CVE-2026-63076 (CVSS 7.5) — Issue summary: OpenSSL CMP password based protection verification only checks whether the protectionAlg parame…
    CVE-2026-63074 (CVSS 5.9) — Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches additional certificates (extraCerts) s…
    CVE-2026-63073 (CVSS 9.8) — Issue summary: OpenSSL CMP response validation passed an unexpected response sender distinguished name directl…
    CVE-2026-18798 (CVSS 7.5) — Issue summary: QUIC server may double free QRX (QUIC record layer RX) object when channel creation fails for i…
    CVE-2026-14456 (CVSS 7.5) — Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unkn…

    References

    http://aix.software.ibm.com/aix/efixes/security/openssl_advisory.asc
    http://cvs.openssl.org/chngview?cn=19374
    http://groups.google.com/group/mailing.openssl.users/browse_thread/thread/c3e1ab0034ca4b4c/66aa896c3a78b2f7
    http://lists.fedoraproject.org/pipermail/package-announce/2010-April/038587.html
    http://lists.fedoraproject.org/pipermail/package-announce/2010-April/039561.html
    http://marc.info/?l=bugtraq&m=127128920008563&w=2
    http://marc.info/?l=bugtraq&m=127557640302499&w=2
    http://secunia.com/advisories/39461
    http://secunia.com/advisories/39932
    http://secunia.com/advisories/42724
    http://secunia.com/advisories/42733
    http://secunia.com/advisories/43311
    http://www.mail-archive.com/dovecot%40dovecot.org/msg26224.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:076
    http://www.openssl.org/news/changelog.html
    http://www.openwall.com/lists/oss-security/2010/03/03/5
    http://www.securityfocus.com/archive/1/516397/100/0/threaded
    http://www.vmware.com/security/advisories/VMSA-2011-0003.html
    http://www.vmware.com/support/vsphere4/doc/vsp_vc41_u1_rel_notes.html
    http://www.vupen.com/english/advisories/2010/0839
    http://www.vupen.com/english/advisories/2010/0916
    http://www.vupen.com/english/advisories/2010/0933
    http://www.vupen.com/english/advisories/2010/1216
    https://bugzilla.redhat.com/show_bug.cgi?id=567711
    https://bugzilla.redhat.com/show_bug.cgi?id=569774
    https://kb.bluecoat.com/index?page=content&id=SA50
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12260
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6718
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9856
    http://aix.software.ibm.com/aix/efixes/security/openssl_advisory.asc
    http://cvs.openssl.org/chngview?cn=19374
    http://groups.google.com/group/mailing.openssl.users/browse_thread/thread/c3e1ab0034ca4b4c/66aa896c3a78b2f7
    http://lists.fedoraproject.org/pipermail/package-announce/2010-April/038587.html
    http://lists.fedoraproject.org/pipermail/package-announce/2010-April/039561.html
    http://marc.info/?l=bugtraq&m=127128920008563&w=2
    http://marc.info/?l=bugtraq&m=127557640302499&w=2
    http://secunia.com/advisories/39461
    http://secunia.com/advisories/39932
    http://secunia.com/advisories/42724
    http://secunia.com/advisories/42733
    http://secunia.com/advisories/43311
    http://www.mail-archive.com/dovecot%40dovecot.org/msg26224.html
    http://www.mandriva.com/security/advisories?name=MDVSA-2010:076
    http://www.openssl.org/news/changelog.html
    http://www.openwall.com/lists/oss-security/2010/03/03/5
    http://www.securityfocus.com/archive/1/516397/100/0/threaded
    http://www.vmware.com/security/advisories/VMSA-2011-0003.html
    http://www.vmware.com/support/vsphere4/doc/vsp_vc41_u1_rel_notes.html
    http://www.vupen.com/english/advisories/2010/0839
    http://www.vupen.com/english/advisories/2010/0916
    http://www.vupen.com/english/advisories/2010/0933
    http://www.vupen.com/english/advisories/2010/1216
    https://bugzilla.redhat.com/show_bug.cgi?id=567711
    https://bugzilla.redhat.com/show_bug.cgi?id=569774
    https://kb.bluecoat.com/index?page=content&id=SA50
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000101.html
    https://lists.balabit.com/pipermail/syslog-ng-announce/2011-January/000102.html
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12260
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6718
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9856

    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