CVE-2008-4969

ltp-network-test 20060918 allows local users to overwrite arbitrary files via a symlink attack on (a) /tmp/vsftpd.conf, (b) /tmp/udp/2/, (c) /tmp/tcp/2/, (d) /tmp/udp/3/, (e) /tmp/tcp/3/, (f) /tmp/nfs_fsstress.udp.2.log, (g) /tmp/nfs_fsstress.udp.3.log, (h) /tmp/nfs_fsstress.tcp.2.log, (i) /tmp/nfs_fsstress.tcp.3.log, and (j) /tmp/nfs_fsstress.sardata temporary files, related to the (1) ftp_setup_vsftp_conf and (2) nfs_fsstress.sh scripts.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• http://bugs.debian.org/496411
• http://dev.gentoo.org/~rbu/security/debiantemp/ltp-network-te
• http://www.openwall.com/lists/oss-security/2008/10/30/2
• https://bugs.gentoo.org/show_bug.cgi?id=235770
• https://exchange.xforce.ibmcloud.com/vulnerabilities/46566