Out-of-bounds read in ClamAV

1) Out-of-bounds read

EUVDB-ID: #VU32026

Risk: Medium

CVSSv3.1: 4.8 [AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1787

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the Portable Document Format (PDF) scanning functionality of Clam AntiVirus (ClamAV) Software versions 0.101.1 and prior could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a lack of proper data handling mechanisms within the device buffer while indexing remaining file data on an affected device. An attacker could exploit this vulnerability by sending crafted PDF files to an affected device. A successful exploit could allow the attacker to cause a heap buffer out-of-bounds read condition, resulting in a crash that could result in a denial of service condition on an affected device. A remote attacker can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Update to version 0.101.2.

Vulnerable software versions

ClamAV: 0.101.0 - 0.101.1

External links

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00062.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00064.html
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=12181
http://lists.debian.org/debian-lts-announce/2019/04/msg00019.html
http://security.gentoo.org/glsa/201904-12

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.