Link following in PEAR

1) Link following

EUVDB-ID: #VU45260

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2011-1144

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 1.9.2 and earlier 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. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-1072.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PEAR: 0.2.2 - 1.9.1

CPE2.3

• cpe:2.3:a:php_group:pear:0.2.2:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:pear:0.9:*:*:*:*:*:*:*
• cpe:2.3:a:php_group:pear:0.10:*:*:*:*:*:*:*

External links

https://openwall.com/lists/oss-security/2011/02/28/5
https://openwall.com/lists/oss-security/2011/03/01/4
https://openwall.com/lists/oss-security/2011/03/01/5
https://openwall.com/lists/oss-security/2011/03/01/7
https://openwall.com/lists/oss-security/2011/03/01/8
https://openwall.com/lists/oss-security/2011/03/01/9
https://pear.php.net/bugs/bug.php?id=18056
https://exchange.xforce.ibmcloud.com/vulnerabilities/65911

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.