#VU19971 Out-of-bounds read in Mgetty+Sendfax - CVE-2019-1010190

Vulnerability identifier: #VU19971

Vulnerability risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2019-1010190

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mgetty+Sendfax
Client/Desktop applications / Other client software

Vendor: EDV-Beratung Gert Döring

Description

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

The vulnerability exists due to a boundary condition in the "putwhitespan()" function of mgetty in the "g3/pbm2g3.c" file. A remote attacker can create a specially crafted file, trick a victim to open it, trigger out-of-bounds read error and crash the affected application, results in a DoS condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mgetty+Sendfax: 1.1.0 - 1.1.37-Jun05

---

External links
https://www.x41-dsec.de/lab/advisories/x41-2018-007-mgetty/
https://mgetty.greenie.net/

---

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. However, proof of concept for this vulnerability is available.