CVE-2011-1072

The installer in PEAR before 1.9.2 allows local users to overwrite arbitrary files via a symlink attack on the package.xml file, related to the (1) download_dir, (2) cache_dir, (3) tmp_dir, and (4) pear-build-download directories, a different vulnerability than CVE-2007-2519.

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

Name	Vendor	Start Version	End Version
Pear	Php	*	1.9.1 (including)
Pear	Php	0.2.2 (including)	0.2.2 (including)
Pear	Php	0.9 (including)	0.9 (including)
Pear	Php	0.10 (including)	0.10 (including)
Pear	Php	0.11 (including)	0.11 (including)
Pear	Php	0.90 (including)	0.90 (including)
Pear	Php	1.0 (including)	1.0 (including)
Pear	Php	1.0.1 (including)	1.0.1 (including)
Pear	Php	1.1 (including)	1.1 (including)
Pear	Php	1.2 (including)	1.2 (including)
Pear	Php	1.2.1 (including)	1.2.1 (including)
Pear	Php	1.3 (including)	1.3 (including)
Pear	Php	1.3.1 (including)	1.3.1 (including)
Pear	Php	1.3.3 (including)	1.3.3 (including)
Pear	Php	1.3.3.1 (including)	1.3.3.1 (including)
Pear	Php	1.3.4 (including)	1.3.4 (including)
Pear	Php	1.3.5 (including)	1.3.5 (including)
Pear	Php	1.3.6 (including)	1.3.6 (including)
Pear	Php	1.4.0 (including)	1.4.0 (including)
Pear	Php	1.4.0-rc1 (including)	1.4.0-rc1 (including)
Pear	Php	1.4.0-rc2 (including)	1.4.0-rc2 (including)
Pear	Php	1.4.1 (including)	1.4.1 (including)
Pear	Php	1.4.2 (including)	1.4.2 (including)
Pear	Php	1.5.0 (including)	1.5.0 (including)
Pear	Php	1.5.1 (including)	1.5.1 (including)
Pear	Php	1.6.1 (including)	1.6.1 (including)
Red Hat Enterprise Linux 6	RedHat	php-pear-1:1.9.4-4.el6	*
Php5	Ubuntu	dapper	*
Php5	Ubuntu	hardy	*
Php5	Ubuntu	karmic	*
Php5	Ubuntu	lucid	*
Php5	Ubuntu	maverick	*
Php5	Ubuntu	upstream	*

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.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2011-1072
CWE	https://cwe.mitre.org/data/definitions/59.html

Improper Link Resolution Before File Access ('Link Following')

Weakness

Affected Software

Potential Mitigations

References

CVE-2011-1072

Improper Link Resolution Before File Access ('Link Following')

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References