Link following in PEAR

1) Link following

EUVDB-ID: #VU45253

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1072

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate or delete data.

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PEAR: 0.2.2 - 1.6.1

External links

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=546164
http://news.php.net/php.pear.cvs/61264
http://openwall.com/lists/oss-security/2011/02/28/12
http://openwall.com/lists/oss-security/2011/02/28/3
http://openwall.com/lists/oss-security/2011/02/28/5
http://openwall.com/lists/oss-security/2011/03/01/4
http://openwall.com/lists/oss-security/2011/03/01/5
http://openwall.com/lists/oss-security/2011/03/01/7
http://openwall.com/lists/oss-security/2011/03/01/8
http://openwall.com/lists/oss-security/2011/03/01/9
http://pear.php.net/advisory-20110228.txt
http://pear.php.net/bugs/bug.php?id=18056
http://secunia.com/advisories/43533
http://security-tracker.debian.org/tracker/CVE-2011-1072
http://svn.php.net/viewvc?view=revision&revision=308687
http://www.mandriva.com/security/advisories?name=MDVSA-2011:187
http://www.redhat.com/support/errata/RHSA-2011-1741.html
http://www.securityfocus.com/bid/46605
http://exchange.xforce.ibmcloud.com/vulnerabilities/65721

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.