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Gentoo Linux: MySQL, Opera

May 25, 2004, 22:43 (0 Talkback[s])

Gentoo Linux Security Advisory GLSA 200405-20

http://security.gentoo.org/


Severity: Normal
Title: Insecure Temporary File Creation In MySQL
Date: May 25, 2004
Bugs: #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 / Vulnerable / Unaffected
1 dev-db/mysql < 4.0.18-r2 >= 4.0.18-r2

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 Nth 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.

    # emerge sync
    # emerge -pv ">=dev-db/mysql-4.0.18-r2"
    # emerge ">=dev-db/mysql-4.0.18-r2"

References

[ 1 ] CAN-2004-0381

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0381 [ 2 ] CAN-2004-0388

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0388

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200405-20.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2004 Gentoo Technologies, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0


Gentoo Linux Security Advisory GLSA 200405-19

http://security.gentoo.org/


Severity: Normal
Title: Opera telnet URI handler file creation/truncation vulnerability
Date: May 25, 2004
Bugs: #50857
ID: 200405-19


Synopsis

A vulnerability exists in Opera's telnet URI handler that may allow a remote attacker to overwrite arbitrary files.

Background

Opera is a multi-platform web browser.

Affected packages


Package / Vulnerable / Unaffected
1 net-www/opera < 7.50_beta1 >= 7.50_beta1

Description

The telnet URI handler in Opera does not check for leading '-' characters in the host name. Consequently, a maliciously-crafted telnet:// link may be able to pass options to the telnet program itself. One example would be the following:

telnet://-nMyFile

If MyFile exists in the user's home directory and the user clicking on the link has write permissions to it, the contents of the file will be overwritten with the output of the telnet trace information. If MyFile does not exist, the file will be created in the user's home directory.

Impact

This exploit has two possible impacts. First, it may create new files in the user's home directory. Second, and far more serious, it may overwrite existing files that the user has write permissions to. An attacker with some knowledge of a user's home directory might be able to destroy important files stored within.

Workaround

Disable the telnet URI handler from within Opera.

Resolution

All Opera users are encouraged to upgrade to the latest version of the program:

    # emerge sync
    # emerge -pv ">=net-www/opera-7.50_beta1"
    # emerge ">=net-www/opera-7.50_beta1"

References

[ 1 ] iDEFENSE Security Advisory 05.12.04

http://www.idefense.com/application/poi/display?id=104&type=vulnerabilities&flashstatus=true

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200405-19.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2004 Gentoo Technologies, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.