Use of Externally-Controlled Format String Affecting exim4 package, versions <4.75-3


Severity

Recommended
0.0
high
0
10

Based on Debian security rating

    Threat Intelligence

    EPSS
    9.72% (95th percentile)

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  • Snyk ID SNYK-DEBIAN11-EXIM4-515264
  • published 5 Oct 2011
  • disclosed 5 Oct 2011

How to fix?

Upgrade Debian:11 exim4 to version 4.75-3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream exim4 package and not the exim4 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

Format string vulnerability in the dkim_exim_verify_finish function in src/dkim.c in Exim before 4.76 might allow remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via format string specifiers in data used in DKIM logging, as demonstrated by an identity field containing a % (percent) character.

CVSS Scores

version 3.1
Expand this section

NVD

7.3 high
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    Low
  • Integrity (I)
    Low
  • Availability (A)
    Low