Exim Privilege Escalation Vulnerability
Exim 4.72 and earlier allows local users to gain privileges by leveraging the ability of the exim user account to specify an alternate configuration file with a directive that contains arbitrary commands, as demonstrated by the…
Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.
Exploitation probability EPSS · FIRST
Exploitation signals 3 / 5
- KEV catalog (CISA)25 Mar 2022
- Exploited in EUVD (ENISA)25 Mar 2022
- Used by ransomwareno
- EPSS above 10 %18.0%
- No account, over the networkno
What to do
Fix
Apply the vendor’s fix as soon as it is available.
CISA guidance: Apply updates per vendor instructions.
Meanwhile
Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.
Manufacturers (CRA)
Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained
Description ENISA EUVD
Exim 4.72 and earlier allows local users to gain privileges by leveraging the ability of the exim user account to specify an alternate configuration file with a directive that contains arbitrary commands, as demonstrated by the spool_directory directive.
Affected products
Open source packages OSV
Affected libraries according to OSV, with fixed versions.
Timeline
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Published
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Exploitation reported (ENISA)
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Added to the KEV catalog
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CISA remediation due date
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EPSS peak: 18.0%
References
Other exploited vulnerabilities from the same vendor
- CVE-2010-4344Exim Heap-Based Buffer Overflow Vulnerability8.5 · Background exploitation
- CVE-2019-16928Exim Out-of-bounds Write Vulnerability7.6 · Background exploitation
- CVE-2019-10149Exim Mail Transfer Agent (MTA) Improper Input Validation9.0 · Background exploitation
- CVE-2018-6789Exim Buffer Overflow Vulnerability9.4 · Background exploitation