SB2018082121 - Integer overflow in krb5 (Alpine package)
Published: August 21, 2018
Security Bulletin ID
SB2018082121
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Integer overflow (CVE-ID: CVE-2018-5709)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=a2500ef1ae5455f033e321b01179470b51b624aa
- https://git.alpinelinux.org/aports/commit/?id=896ae53d1849faa57ea676acd47332399c11bae7
- https://git.alpinelinux.org/aports/commit/?id=9f75bfdaed5cb618df31231e870ec6fed8953927
- https://git.alpinelinux.org/aports/commit/?id=cb2ae9a4a2b9b249ba83323406199eb1836f6ded