CVE-2019-14868 — In ksh version 20120801, a flaw was found in the way it evaluates certain enviro
In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to prov
Published
2020-04-02T16:48:57.000Z
Last modified
2024-08-05T00:26:39.141Z
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
01What is this vulnerability?
In ksh version 20120801, a flaw was found in the way it evaluates certain environment variables. An attacker could use this flaw to override or bypass environment restrictions to execute shell commands. Services and applications that allow remote unauthenticated attackers to provide one of those environment variables could allow them to exploit this issue remotely.
02Affected products
| Vendor | Product | Versions |
|---|
| KornShell | ksh | 20120801 |
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
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2020-04-02T16:48:57.000Z
- Last modified: 2024-08-05T00:26:39.141Z
09References
- bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14868
- github.com — https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2
- support.apple.com — https://support.apple.com/kb/HT211170
- seclists.org — http://seclists.org/fulldisclosure/2020/May/53
- lists.debian.org — https://lists.debian.org/debian-lts-announce/2020/07/msg00015.html
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