ubuntu-cve-2017-17439
Vulnerability from osv_ubuntu
Published
2017-12-06 15:29
Modified
2025-07-16 04:53
Summary
Details
In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "heimdal-clients",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-clients-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-dev",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-docs",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-kcm",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-kcm-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-kdc",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-kdc-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-multidev",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-multidev-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-servers",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "heimdal-servers-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libasn1-8-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libasn1-8-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libgssapi3-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libgssapi3-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhcrypto4-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhcrypto4-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhdb9-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhdb9-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libheimbase1-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libheimbase1-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libheimntlm0-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libheimntlm0-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhx509-5-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libhx509-5-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkadm5clnt7-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkadm5clnt7-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkadm5srv8-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkadm5srv8-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkafs0-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkafs0-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkdc2-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkdc2-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkrb5-26-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libkrb5-26-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libotp0-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libotp0-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libroken18-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libroken18-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libsl0-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libsl0-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libwind0-heimdal",
"binary_version": "7.5.0+dfsg-1"
},
{
"binary_name": "libwind0-heimdal-dbgsym",
"binary_version": "7.5.0+dfsg-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "heimdal",
"purl": "pkg:deb/ubuntu/heimdal@7.5.0+dfsg-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.5.0+dfsg-1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"7.4.0.dfsg.1-2"
]
}
],
"aliases": [],
"details": "In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.",
"id": "UBUNTU-CVE-2017-17439",
"modified": "2025-07-16T04:53:10Z",
"published": "2017-12-06T15:29:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2017-17439"
},
{
"type": "REPORT",
"url": "http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-17439"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2017-17439"
],
"withdrawn": "2025-07-18T16:44:16Z"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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