ALAS-2021-1497


Amazon Linux AMI Security Advisory: ALAS-2021-1497
Advisory Release Date: 2021-05-06 19:11 Pacific
Advisory Updated Date: 2021-05-07 20:34 Pacific
Severity: Important

Issue Overview:

Prior versions of Exim 4 have Improper Neutralization of Line Delimiters. Local users can alter the behavior of root processes because a recipient address can have a newline character. (CVE-2020-28015)

Prior versions of Exim 4 allowed Integer Overflow to Buffer Overflow in receive_add_recipient via an e-mail message with fifty million recipients. NOTE: remote exploitation may be difficult because of resource consumption. (CVE-2020-28017)

Prior versions of Exim 4 allowed Use After Free in smtp_reset in certain situations that may be common for builds with OpenSSL. (CVE-2020-28018)

Prior versions of Exim 4 have Improper Neutralization of Line Delimiters. An authenticated remote SMTP client can insert newline characters into a spool file (which indirectly leads to remote code execution as root) via AUTH= in a MAIL FROM command. (CVE-2020-28021)


Affected Packages:

exim


Issue Correction:
Run yum update exim to update your system.

New Packages:
i686:
    exim-mysql-4.92-1.27.amzn1.i686
    exim-mon-4.92-1.27.amzn1.i686
    exim-debuginfo-4.92-1.27.amzn1.i686
    exim-4.92-1.27.amzn1.i686
    exim-greylist-4.92-1.27.amzn1.i686
    exim-pgsql-4.92-1.27.amzn1.i686

src:
    exim-4.92-1.27.amzn1.src

x86_64:
    exim-4.92-1.27.amzn1.x86_64
    exim-mon-4.92-1.27.amzn1.x86_64
    exim-greylist-4.92-1.27.amzn1.x86_64
    exim-pgsql-4.92-1.27.amzn1.x86_64
    exim-mysql-4.92-1.27.amzn1.x86_64
    exim-debuginfo-4.92-1.27.amzn1.x86_64