Summary
Ein Angreifer kann mehrere Schwachstellen in MIT Kerberos ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Informationen auszulesen, Daten zu manipulieren, beliebigen Programmcode auszuführen oder einen Denial-of-Service-Zustand herbeizuführen.
Product
Kerberos ist ein verteilter Netzwerkdienst zur Authentifizierung. MIT Kerberos ist die freie Implementierung des "Kerberos network authentication protocol", des Massachusetts Institute of Technology (MIT).
Vulnerabilities 15
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High 7.5
Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries
clnttcp_call() in lib/rpc/clnt_tcp.c in MIT Kerberos 5 (aka krb5) does not free the RPC reply verifier between retries, which allows remote attackers to cause a denial of service (memory leak in GSS-RPC client programs) by injecting RPC replies with mismatche…
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High 7.5
Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching
The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote atta…
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High 7.5
Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths
The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) does not free decoded arguments on certain error paths, which allows remote attackers to cause a denial of service (memory exhaustion in kadmind) via crafted AUTH_GSSAPI_INIT re…
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High 7.5
Krb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup
clean_client() in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) restarts its scan from the head of the client list after each removal, resulting in quadratic CPU cost. Remote attackers can cause a denial of service (CPU consumption in kadmind) by acc…
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High 7.5
Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init requests
The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) 1.5.2 and later allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by sending repeated failed AUTH_GSSAPI_INIT requests. Each failed request all…
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High 7.5
Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding
decode_sequence_of() in lib/krb5/asn.1/asn1_encode.c in MIT Kerberos 5 (aka krb5) 1.11 and later grows the decoded element array one entry at a time, which allows remote attackers to cause a denial of service (CPU consumption in the KDC) by sending an unauthe…
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Medium 6.5
MIT krb5 through 1.22.2 NULL Pointer Dereference via krb5_rd_cred()
MIT Kerberos 5 (krb5) through 1.22.2 contains a NULL pointer dereference in make_cred_list() in rd_cred.c that allows authenticated Kerberos clients to crash services by sending mismatched KRB-CRED arrays. Attackers can send forwarded credentials with more ti…
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Medium 6.5
Krb5: mit krb5 kadmind authenticated memory leak dos in xdr_krb5_tl_data() decode failure
xdr_krb5_tl_data() in lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) does not free partially decoded data on failure, which allows remote authenticated users to cause a denial of service (memory leak in kadmind) via crafted RPC requests that trigger a …
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Medium 6.5
Krb5: mit krb5 kadmind authenticated dos exploiting dereference of null policy name pointers
The policy RPC stubs in kadmin/server/server_stubs.c in MIT Kerberos 5 (aka krb5) 1.5.3 and later do not reject a NULL policy name decoded by xdr_nullstring(), which allows remote authenticated users to cause a denial of service (kadmind crash via NULL pointe…
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Medium 6.5
Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation
The GSS-RPC layer in MIT Kerberos 5 (aka krb5) does not enforce size limits on XDR-decoded data, which allows remote authenticated users to cause a denial of service (memory exhaustion or excessive CPU consumption in kadmind) via crafted RPC requests that tri…
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Medium 5.9
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_…
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Medium 5.9
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an applic…
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Medium 5.3
Krb5: mit krb5 kadmind unauthenticated memory leak dos in rpcsec_gss buffer decode failure
The RPCSEC_GSS authentication routines in lib/rpc/authgss_prot.c in MIT Kerberos 5 (aka krb5) 1.4 and later do not free partially decoded buffers on failure, which allows remote attackers to cause a denial of service (memory leak in kadmind) via crafted RPCSE…
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Medium 5.3
Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path
krb5_ktkdb_get_entry() in lib/kdb/keytab.c in MIT Kerberos 5 (aka krb5) 1.2.8 and later does not free decrypted key material when a post-decryption check fails, which allows remote attackers to cause a denial of service (memory leak in the KDC or kadmind) via…
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Medium 4.9
MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC
MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S…
Revision history
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#3
Neue Updates von Red Hat aufgenommen
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#2
Neue Updates von Red Hat aufgenommen
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#1
Initiale Fassung
References
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MIT krb5 Security Advisory 2026-001 vom 2026-11-09
https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt
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Red Hat Security Advisory RHSA-2026:97456 vom 2026-11-10
https://access.redhat.com/errata/RHSA-2026:97456
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Red Hat Security Advisory RHSA-2026:97811 vom 2026-11-10
https://access.redhat.com/errata/RHSA-2026:97811
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Rocky Linux Security Advisory RLSA-2026:97456 vom 2026-11-11
https://errata.build.resf.org/RLSA-2026:97456
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Red Hat Security Advisory RHSA-2026:99715 vom 2026-11-13
https://access.redhat.com/errata/RHSA-2026:99715
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Red Hat Security Advisory RHSA-2026:99625 vom 2026-11-12
https://access.redhat.com/errata/RHSA-2026:99625
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Red Hat Security Advisory RHSA-2026:99716 vom 2026-11-13
https://access.redhat.com/errata/RHSA-2026:99716
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Rocky Linux Security Advisory RLSA-2026:99624 vom 2026-11-13
https://errata.build.resf.org/RLSA-2026:99624