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Bug 1535554 - (CVE-2018-5709) CVE-2018-5709 krb5: integer overflow in dbentry->n_key_data in kadmin/dbutil/dump.c
CVE-2018-5709 krb5: integer overflow in dbentry->n_key_data in kadmin/dbutil/...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180115,repor...
: Security
Depends On: 1535555
Blocks: 1535566
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Reported: 2018-01-17 10:38 EST by Laura Pardo
Modified: 2018-04-24 00:46 EDT (History)
43 users (show)

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Last Closed: 2018-02-15 00:52:59 EST
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Description Laura Pardo 2018-01-17 10:38:46 EST 
An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.

References:
https://github.com/poojamnit/Kerberos-V5-1.16-Vulnerabilities
Comment 1 Laura Pardo 2018-01-17 10:40:08 EST 
Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1535555]
Comment 4 Huzaifa S. Sidhpurwala 2018-02-01 23:46:06 EST 
Statement:

This is essentially an integer truncation issue, and not an integer overflow. We have determined that this should not affect any other data allocated close to the  16-bit integer in question "dbentry-> n_key_data". Red Hat Product Security does not consider this issue as a security flaw.
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