Remote code execution in Compress::Raw::Zlib Perl module

1) Off-by-one error

EUVDB-ID: #VU6170

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2009-1391

CWE-ID: CWE-193 - Off-by-one Error

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to off-by-one error in Zlib.xs in Compress::Raw::Zlib Perl module before 2.017 when processing specially crafted zlib archives. A remote attacker can pass a specially crafted zlib archive to vulnerable application, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation may allow an attacker to compromise vulnerable system.

Note: this vulnerability is being actively exploited in the wild against AMaViS and SpamAssassin, which use vulnerable Perl module.

Mitigation

Update Compress::Raw::Zlib Perl module to version 2.017.

Vulnerable software versions

Compress::Raw::Zlib: 2.015

CPE2.3

• cpe:2.3:a:perl:compress_raw_zlib:2.015:*:*:*:*:perl:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=504386
https://code.activestate.com/lists/activeperl/%3c00e401ca276c$9deaea50$d9c0bef0$@com%3e/

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted archive.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.