Denial of service in xpdf

1) Infinite loop

EUVDB-ID: #VU10946

Risk: Low

CVSSv3.1: 5.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-7173

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the JBIG2Stream::readSymbolDictSeg function due to improper decoding operations. A remote attacker can send a specially crafted file, trick the victim into opening it, trigger infinite loop and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xpdf: 4.00.0

External links

http://forum.xpdfreader.com/viewtopic.php?f=3&t=607&sid=11bd8b04899690698c3d87410472e5dd

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 visit a specially crafted website or open a file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.