suse-su-2025:3729-1
Vulnerability from csaf_suse
Published
2025-10-22 13:19
Modified
2025-10-22 13:19
Summary
Security update for krb5
Notes
Title of the patch
Security update for krb5
Description of the patch
This update for krb5 fixes the following issues:
- CVE-2025-3576: weakness in the MD5 checksum design allows for spoofing of GSSAPI-protected messages that are using
RC4-HMAC-MD5 (bsc#1241219).
Krb5 as very old protocol supported quite a number of ciphers
that are not longer up to current cryptographic standards.
To avoid problems with those, SUSE has by default now disabled
those alorithms.
The following algorithms have been removed from valid krb5 enctypes:
- des3-cbc-sha1
- arcfour-hmac-md5
To reenable those algorithms, you can use allow options in krb5.conf:
[libdefaults]
allow_des3 = true
allow_rc4 = true
to reenable them.
Patchnames
SUSE-2025-3729,SUSE-SLE-Micro-5.3-2025-3729,SUSE-SLE-Micro-5.4-2025-3729
Terms of use
CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
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"distribution": {
"text": "Copyright 2024 SUSE LLC. All rights reserved.",
"tlp": {
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"text": "This update for krb5 fixes the following issues:\n\n- CVE-2025-3576: weakness in the MD5 checksum design allows for spoofing of GSSAPI-protected messages that are using\n RC4-HMAC-MD5 (bsc#1241219).\n\nKrb5 as very old protocol supported quite a number of ciphers\nthat are not longer up to current cryptographic standards.\n\nTo avoid problems with those, SUSE has by default now disabled\nthose alorithms.\n\nThe following algorithms have been removed from valid krb5 enctypes:\n\n- des3-cbc-sha1\n- arcfour-hmac-md5\n\nTo reenable those algorithms, you can use allow options in krb5.conf:\n\n[libdefaults]\nallow_des3 = true\nallow_rc4 = true\n\nto reenable them.\n",
"title": "Description of the patch"
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"title": "Patchnames"
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}
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"category": "general",
"text": "A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to unauthorized message tampering.",
"title": "CVE description"
}
],
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{
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"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
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"threats": [
{
"category": "impact",
"date": "2025-10-22T13:19:35Z",
"details": "moderate"
}
],
"title": "CVE-2025-3576"
}
]
}
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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.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- 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.
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