SUSE-SU-2025:3729-1
Vulnerability from csaf_suse - Published: 2025-10-22 13:19 - Updated: 2025-10-22 13:19Summary
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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}
],
"notes": [
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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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"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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"scores": [
{
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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 observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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