Loop with Unreachable Exit Condition ('Infinite Loop') Affecting exim4 package, versions <4.89-2+deb9u2
Snyk CVSS
Threat Intelligence
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk ID SNYK-DEBIAN9-EXIM4-382885
- published 25 Nov 2017
- disclosed 25 Nov 2017
Introduced: 25 Nov 2017
CVE-2017-16944 Open this link in a new tabHow to fix?
Upgrade Debian:9
exim4
to version 4.89-2+deb9u2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream exim4
package and not the exim4
package as distributed by Debian
.
See How to fix?
for Debian:9
relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-16944
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16944
- https://www.debian.org/security/2017/dsa-4053
- https://www.exploit-db.com/exploits/43184/
- https://bugs.exim.org/show_bug.cgi?id=2201
- https://lists.exim.org/lurker/message/20171125.034842.d1d75cac.en.html
- http://www.openwall.com/lists/oss-security/2021/05/04/7
- http://openwall.com/lists/oss-security/2017/11/25/1
- http://openwall.com/lists/oss-security/2017/11/25/2
- http://openwall.com/lists/oss-security/2017/11/25/3
- http://www.securitytracker.com/id/1039873
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-16944