ESB-2017.3078 - [FreeBSD] exim: Denial of service - Remote/unauthenticated 2017-12-01

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.3078
               exim -- remote DoS attack in BDAT processing
                              1 December 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           exim
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-16944  

Reference:         ESB-2017.3036

Original Bulletin: 
   http://www.vuxml.org/freebsd/75dd622c-d5fd-11e7-b9fe-c13eb7bcbf4f.html

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exim -- remote DoS attack in BDAT processing

Affected packages 4.88 <= exim < 4.89.1 Details

VuXML ID 75dd622c-d5fd-11e7-b9fe-c13eb7bcbf4f Discovery 2017-11-23 Entry 
2017-11-30 Exim developers team reports:

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

CVE Name CVE-2017-16944 URL https://bugs.exim.org/show_bug.cgi?id=2199

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