cve/2017/CVE-2017-16944.md

### [CVE-2017-16944](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16944)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to cause a denial of service (infinite loop and stack exhaustion) via vectors involving BDAT commands and an improper check for a '.' character signifying the end of the content, related to the bdat_getc function.

### POC

#### Reference
- http://openwall.com/lists/oss-security/2017/11/25/2
- http://openwall.com/lists/oss-security/2017/11/25/3
- http://www.openwall.com/lists/oss-security/2021/05/04/7
- https://bugs.exim.org/show_bug.cgi?id=2201
- https://hackerone.com/reports/296994
- https://www.exploit-db.com/exploits/43184/

#### Github
- https://github.com/00010111/exim_check
- https://github.com/ARPSyndicate/cvemon
- https://github.com/dbrumley/exim-examples
- https://github.com/lnick2023/nicenice
- https://github.com/qazbnm456/awesome-cve-poc
- https://github.com/xbl3/awesome-cve-poc_qazbnm456