CVE-2017-17439 — NULL Pointer Dereference in Project Heimdal

CWE-476 — NULL Pointer Dereference8 documents6 sources
Severity
7.5HIGHNVD
EPSS
4.0%
top 11.57%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Heimdal Project HeimdalDebian Linux
Timeline
PublishedDec 6
Latest updateMay 14

Description

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.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages2 packages

▶Debianheimdal_project/heimdal< 7.5.0+dfsg-1+3

Also affects: Debian Linux 9.0

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-gc5p-r2vh-qc88: In Heimdal through 7↗2022-05-14
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OSV
CVE-2017-17439: In Heimdal through 7↗2017-12-06
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CVEList
CVE-2017-17439: In Heimdal through 7↗2017-12-06
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📋Vendor Advisories

1
Debian
CVE-2017-17439: heimdal - In Heimdal through 7.4, remote unauthenticated attackers are able to crash the K...↗2017
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💬Community

3
Bugzilla
CVE-2017-17439 heimdal: NULL pointer dereference via crafted UDP packets [epel-all]↗2017-12-11
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Bugzilla
CVE-2017-17439 heimdal: NULL pointer dereference via crafted UDP packets↗2017-12-11
▶
Bugzilla
CVE-2017-17439 heimdal: NULL pointer dereference via crafted UDP packets [fedora-all]↗2017-12-11
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CVE-2017-17439 — NULL Pointer Dereference | cvebase