Stack-based buffer overflow in php (Alpine package)

1) Stack-based buffer overflow

EUVDB-ID: #VU32406

Risk: Medium

CVSSv3.1: 6.4 [AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-5590

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the phar_fix_filepath function in ext/phar/phar.c when processing a large length value, as demonstrated by mishandling of an e-mail attachment by the imap PHP extension. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php (Alpine package): 5.4.17-r0 - 5.5.26-r0

External links

http://git.alpinelinux.org/aports/commit/?id=af4ecb2f45cb22986569333512a85f995728a742
http://git.alpinelinux.org/aports/commit/?id=203c60e93f227c5829b37eb04feb8e53045cabdf

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.