Ubuntu update for Perl

1) Off-by-one error

EUVDB-ID: #VU6170

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

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 the affected packages

Ubuntu 9.04:

libcompress-raw-zlib-perl 2.015-1ubuntu0.1

perl 5.10.0-19ubuntu1.1

Ubuntu 8.10:

libcompress-raw-zlib-perl 2.011-2ubuntu0.1

perl 5.10.0-11.1ubuntu2.3

Ubuntu 8.04 LTS:

libcompress-raw-zlib-perl 2.008-1ubuntu0.1

Vulnerable software versions

Compress::Raw::Zlib: 2.015

External links

http://www.ubuntu.com/usn/usn-794-1/

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.