CVE-2019-19920 — sa-exim 4

sa-exim 4.2.1 allows attackers to execute arbitrary code if they can write a .cf file or a rule. This occurs because Greylisting.pm relies on eval (rather than direct parsing and/or use of the taint feature). This issue is similar to CVE-2018-11805.

01What is this vulnerability?

sa-exim 4.2.1 allows attackers to execute arbitrary code if they can write a .cf file or a rule. This occurs because Greylisting.pm relies on eval (rather than direct parsing and/or use of the taint feature). This issue is similar to CVE-2018-11805.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2019-12-22T17:07:31.000Z
• Last modified: 2024-08-05T02:32:10.073Z

09References

• bugs.debian.org — https://bugs.debian.org/946829#24
• marc.info — https://marc.info/?l=spamassassin-users&m=157668107325768&w=2
• marc.info — https://marc.info/?l=spamassassin-users&m=157668305026635&w=2
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/01/msg00006.html
• usn.ubuntu.com — https://usn.ubuntu.com/4520-1/