RHSA-2021:3576
Vulnerability from csaf_redhat
Published
2021-09-21 11:02
Modified
2024-11-22 17:17
Summary
Red Hat Security Advisory: krb5 security update
Notes
Topic
An update for krb5 is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).
Security Fix(es):
* krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS (CVE-2021-36222)
* krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field (CVE-2021-37750)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).\n\nSecurity Fix(es):\n\n* krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS (CVE-2021-36222)\n\n* krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field (CVE-2021-37750)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", title: "Details", }, { category: "legal_disclaimer", text: "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", title: "Terms of Use", }, ], publisher: { category: "vendor", contact_details: "https://access.redhat.com/security/team/contact/", issuing_authority: "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", name: "Red Hat Product Security", namespace: "https://www.redhat.com", }, references: [ { category: "self", summary: "https://access.redhat.com/errata/RHSA-2021:3576", url: "https://access.redhat.com/errata/RHSA-2021:3576", }, { category: "external", summary: "https://access.redhat.com/security/updates/classification/#moderate", url: "https://access.redhat.com/security/updates/classification/#moderate", }, { category: "external", summary: "1983720", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1983720", }, { category: "external", summary: "1996834", url: "https://bugzilla.redhat.com/show_bug.cgi?id=1996834", }, { category: "self", summary: "Canonical URL", url: "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3576.json", }, ], title: "Red Hat Security Advisory: krb5 security update", tracking: { current_release_date: "2024-11-22T17:17:49+00:00", generator: { date: "2024-11-22T17:17:49+00:00", engine: { name: "Red Hat SDEngine", version: "4.2.1", }, }, id: "RHSA-2021:3576", initial_release_date: "2021-09-21T11:02:51+00:00", revision_history: [ { date: "2021-09-21T11:02:51+00:00", number: "1", summary: "Initial version", }, { date: "2021-09-21T11:02:51+00:00", number: "2", summary: "Last updated version", }, { date: "2024-11-22T17:17:49+00:00", number: "3", summary: "Last generated version", }, ], status: "final", version: "3", }, }, product_tree: { branches: [ { branches: [ { branches: [ { category: "product_name", name: "Red Hat Enterprise Linux BaseOS (v. 8)", product: { name: "Red Hat Enterprise Linux BaseOS 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"CVE-2021-36222", cwe: { id: "CWE-476", name: "NULL Pointer Dereference", }, discovery_date: "2021-07-19T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "1983720", }, ], notes: [ { category: "description", text: "A flaw was found in krb5. This flaw allows an unauthenticated attacker to cause a NULL dereference in the KDC by sending a request containing a PA-ENCRYPTED-CHALLENGE padata element without using FAST. The highest threat from this vulnerability is to system availability.", title: "Vulnerability description", }, { category: "summary", text: "krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "BaseOS-8.4.0.Z.MAIN.EUS:krb5-0:1.18.2-8.3.el8_4.src", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.aarch64", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.i686", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.ppc64le", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.s390x", 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"CVE-2021-37750", cwe: { id: "CWE-476", name: "NULL Pointer Dereference", }, discovery_date: "2021-08-21T00:00:00+00:00", ids: [ { system_name: "Red Hat Bugzilla ID", text: "1996834", }, ], notes: [ { category: "description", text: "A flaw was found in krb5. The Key Distribution Center (KDC) in MIT Kerberos 5 has a NULL pointer dereference via a FAST inner body that lacks a server field. An authenticated attacker could use this flaw to crash the Kerberos KDC server. The highest threat from this vulnerability is to system availability.", title: "Vulnerability description", }, { category: "summary", text: "krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field", title: "Vulnerability summary", }, { category: "general", text: "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", title: "CVSS score applicability", }, ], product_status: { fixed: [ "BaseOS-8.4.0.Z.MAIN.EUS:krb5-0:1.18.2-8.3.el8_4.src", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.aarch64", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.i686", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.ppc64le", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.s390x", "BaseOS-8.4.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-8.3.el8_4.x86_64", 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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.