QID 352277

Date Published: 2021-05-13

QID 352277: Amazon Linux Security Update for exim: ALAS-2021-1497

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)

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as Critical - 9 severity.
    • Solution
    Administrators are advised to apply the appropriate software updates.
    Vendor References

    CVEs related to QID 352277

    CVE-2020-28018 | CVE-2020-28015 | CVE-2020-28021 | CVE-2020-28017 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS-2021-1497 Amazon Linux URL Logo alas.aws.amazon.com/ALAS-2021-1497.html
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