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Exim: Heap buffer underflow in smtp_ungetc() (CVE-2020-28024)

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Exim: Heap buffer underflow in smtp_ungetc() (CVE-2020-28024)

Severity
8
CVSS
(AV:N/AC:L/Au:N/C:P/I:P/A:P)
Published
05/06/2021
Created
05/14/2021
Added
05/13/2021
Modified
05/13/2021

Description

Exim 4 before 4.94.2 allows Buffer Underwrite that may result in unauthenticated remote attackers executing arbitrary commands, because smtp_ungetc was only intended to push back characters, but can actually push back non-character error codes such as EOF.

Solution(s)

  • exim-upgrade-4_94_2

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