csaf_redhat - rhsa-2020

rhsa-2020_2210

Vulnerability from csaf_redhat

Published

2020-05-19 22:43

Modified

2024-11-22 14:26

Summary

Red Hat Security Advisory: ksh security update

Notes

Topic

An update for ksh is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details

KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992). Security Fix(es): * ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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        "text": "KornShell (ksh) is a Unix shell developed by AT\u0026T Bell Laboratories, which is backward-compatible with the Bourne shell (sh) and includes many features of the C shell. The most recent version is KSH-93. KornShell complies with the POSIX.2 standard (IEEE Std 1003.2-1992).\n\nSecurity Fix(es):\n\n* ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection (CVE-2019-14868)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2019-14868",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "discovery_date": "2019-10-01T00:00:00+00:00",
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          "category": "description",
          "text": "A flaw was found in the way ksh 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-14868",
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      "release_date": "2019-12-13T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2020-05-19T22:43:17+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
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            "availabilityImpact": "HIGH",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
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      ],
      "title": "ksh: certain environment variables interpreted as arithmetic expressions on startup, leading to code injection"
    }
  ]
}

cve-2019-14868

Vulnerability from cvelistv5

Published

2020-04-02 16:48

Modified

2024-08-05 00:26

Severity ?

7.4 (High) - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

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.

References

▼	URL	Tags
	https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14868	x_refsource_CONFIRM
	https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2	x_refsource_MISC
	https://support.apple.com/kb/HT211170	x_refsource_CONFIRM
	http://seclists.org/fulldisclosure/2020/May/53	mailing-list, x_refsource_FULLDISC
	https://lists.debian.org/debian-lts-announce/2020/07/msg00015.html	mailing-list, x_refsource_MLIST

Impacted products

Vendor

Product

Version

▼

KornShell

ksh

Version: 20120801

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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