Loop with Unreachable Exit Condition ('Infinite Loop') Affecting exim4 package, versions <4.89-13
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-EXIM4-1545048
- published25 Nov 2017
- disclosed25 Nov 2017
Introduced: 25 Nov 2017
CVE-2017-16944 (opens in a new tab)How to fix?
Upgrade Debian:12 exim4 to version 4.89-13 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:12 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