Link following in PHP

1) Link following

EUVDB-ID: #VU41567

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-2014-3981

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.

acinclude.m4, as used in the configure script in PHP 5.5.13 and earlier, allows local users to overwrite arbitrary files via a symlink attack on the /tmp/phpglibccheck file.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PHP: 5.5.0 - 5.5.12

CPE2.3

• cpe:2.3:a:php_group:php:5.5.12:*:*:*:*:*:*:*

External links

https://git.php.net/?p=php-src.git;a=commit;h=91bcadd85e20e50d3f8c2e9721327681640e6f16
https://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html
https://marc.info/?l=bugtraq&m=141017844705317&w=2
https://marc.info/?l=bugtraq&m=141390017113542&w=2
https://openwall.com/lists/oss-security/2014/06/06/12
https://seclists.org/fulldisclosure/2014/Jun/21
https://support.apple.com/kb/HT6443
https://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
https://www-01.ibm.com/support/docview.wss?uid=swg21683486
https://bugs.php.net/bug.php?id=67390
https://bugzilla.redhat.com/show_bug.cgi?id=1104978
https://support.apple.com/HT204659

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.