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[ GLSA 200405-20 ] Insecure Temporary File Creation In MySQL
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GLSA
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Joined: 13 Jun 2003
Posts: 4078
Location: Barcelona, Spain

PostPosted: Tue May 25, 2004 9:14 pm    Post subject: [ GLSA 200405-20 ] Insecure Temporary File Creation In MySQL Reply with quote

Gentoo Linux Security Advisory

Title: Insecure Temporary File Creation In MySQL (GLSA 200405-20)
Severity: normal
Exploitable: local
Date: May 25, 2004
Bug(s): #46242
ID: 200405-20

Synopsis

Two MySQL utilities create temporary files with hardcoded paths, allowing an attacker to use a symlink to trick MySQL into overwriting important data.

Background

MySQL is a popular open-source multi-threaded, multi-user SQL database server.

Affected Packages

Package: dev-db/mysql
Vulnerable: < 4.0.18-r2
Unaffected: >= 4.0.18-r2
Architectures: All supported architectures


Description

The MySQL bug reporting utility (mysqlbug) creates a temporary file to log bug reports to. A malicious local user with write access to the /tmp directory could create a symbolic link of the name mysqlbug- N pointing to a protected file, such as /etc/passwd, such that when mysqlbug creates the N th log file, it would end up overwriting the target file. A similar vulnerability exists with the mysql_multi utility, which creates a temporary file called mysql_multi.log.

Impact

Since mysql_multi runs as root, a local attacker could use this to destroy any other users' data or corrupt and destroy system files.

Workaround

One could modify both scripts to log to a directory that users do not have write permission to, such as /var/log/mysql/.

Resolution

All users should upgrade to the latest stable version of MySQL.
Code:
# emerge sync
# emerge -pv ">=dev-db/mysql-4.0.18-r2"
# emerge ">=dev-db/mysql-4.0.18-r2"


References

CAN-2004-0381
CAN-2004-0388


Last edited by GLSA on Sun May 07, 2006 4:51 pm; edited 1 time in total
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