Amazon Linux 1 Security Advisory: ALAS-2017-932
Advisory Release Date: 2017-12-20 18:51 Pacific
Advisory Updated Date: 2017-12-21 22:55 Pacific
Severity:
Critical
Issue Overview:
Use-after-free in receive_msg function via vectors involving BDAT commands
The receive_msg function in receive.c in the SMTP daemon in Exim 4.88 and 4.89 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via vectors involving BDAT commands. (CVE-2017-16943)
Infinite loop and stack exhaustion in receive_msg function via vectors involving BDAT commands
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. (CVE-2017-16944)
Affected Packages:
exim
Issue Correction:
Run yum update exim to update your system.
New Packages:
i686:
exim-mysql-4.89-4.17.amzn1.i686
exim-greylist-4.89-4.17.amzn1.i686
exim-debuginfo-4.89-4.17.amzn1.i686
exim-pgsql-4.89-4.17.amzn1.i686
exim-mon-4.89-4.17.amzn1.i686
exim-4.89-4.17.amzn1.i686
src:
exim-4.89-4.17.amzn1.src
x86_64:
exim-debuginfo-4.89-4.17.amzn1.x86_64
exim-4.89-4.17.amzn1.x86_64
exim-greylist-4.89-4.17.amzn1.x86_64
exim-mysql-4.89-4.17.amzn1.x86_64
exim-pgsql-4.89-4.17.amzn1.x86_64
exim-mon-4.89-4.17.amzn1.x86_64