RHSA-2021:0989

Vulnerability from csaf_redhat - Published: 2021-03-25 12:56 - Updated: 2025-11-21 18:21
Summary
Red Hat Security Advisory: firefox security update
Severity
Important
Notes
Topic: An update for firefox is now available for Red Hat Enterprise Linux 8.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Critical. 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: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. This update upgrades Firefox to version 78.9.0 ESR. Security Fix(es): * Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read (CVE-2021-23981) * Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9 (CVE-2021-23987) * Mozilla: Internal network hosts could have been probed by a malicious webpage (CVE-2021-23982) * Mozilla: Malicious extensions could have spoofed popup information (CVE-2021-23984) 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.
Terms of Use: 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.
CVE-2021-4127

The Mozilla Foundation Security Advisory describes this issue as: An out of date graphics library (Angle) likely contained vulnerabilities that could potentially be exploited.

9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect. https://access.redhat.com/errata/RHSA-2021:0989
CVE-2021-23981

The Mozilla Foundation Security Advisory describes this issue as: A texture upload of a Pixel Buffer Object could have confused the WebGL code to skip binding the buffer used to unpack it, resulting in memory corruption and a potentially exploitable information leak or crash.

7.5 (High)
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-125 - Out-of-bounds Read
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect. https://access.redhat.com/errata/RHSA-2021:0989
CVE-2021-23982

Using techniques that built on the slipstream research, a malicious webpage could have scanned both an internal network's hosts as well as services running on the user's local machine utilizing WebRTC connections. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

6.1 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect. https://access.redhat.com/errata/RHSA-2021:0989
CVE-2021-23984

The Mozilla Foundation Security Advisory describes this issue as: A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials.

6.1 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-1021 - Improper Restriction of Rendered UI Layers or Frames
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect. https://access.redhat.com/errata/RHSA-2021:0989
CVE-2021-23987

The Mozilla Foundation Security Advisory describes this issue as: Mozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.

8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect. https://access.redhat.com/errata/RHSA-2021:0989
References
https://access.redhat.com/errata/RHSA-2021:0989 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=1942783 external
https://bugzilla.redhat.com/show_bug.cgi?id=1942785 external
https://bugzilla.redhat.com/show_bug.cgi?id=1942786 external
https://bugzilla.redhat.com/show_bug.cgi?id=1942787 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2021-4127 self
https://bugzilla.redhat.com/show_bug.cgi?id=1942784 external
https://www.cve.org/CVERecord?id=CVE-2021-4127 external
https://nvd.nist.gov/vuln/detail/CVE-2021-4127 external
https://www.mozilla.org/en-US/security/advisories… external
https://www.mozilla.org/en-US/security/advisories… external
https://access.redhat.com/security/cve/CVE-2021-23981 self
https://bugzilla.redhat.com/show_bug.cgi?id=1942783 external
https://www.cve.org/CVERecord?id=CVE-2021-23981 external
https://nvd.nist.gov/vuln/detail/CVE-2021-23981 external
https://www.mozilla.org/en-US/security/advisories… external
https://access.redhat.com/security/cve/CVE-2021-23982 self
https://bugzilla.redhat.com/show_bug.cgi?id=1942785 external
https://www.cve.org/CVERecord?id=CVE-2021-23982 external
https://nvd.nist.gov/vuln/detail/CVE-2021-23982 external
https://www.mozilla.org/en-US/security/advisories… external
https://access.redhat.com/security/cve/CVE-2021-23984 self
https://bugzilla.redhat.com/show_bug.cgi?id=1942786 external
https://www.cve.org/CVERecord?id=CVE-2021-23984 external
https://nvd.nist.gov/vuln/detail/CVE-2021-23984 external
https://www.mozilla.org/en-US/security/advisories… external
https://access.redhat.com/security/cve/CVE-2021-23987 self
https://bugzilla.redhat.com/show_bug.cgi?id=1942787 external
https://www.cve.org/CVERecord?id=CVE-2021-23987 external
https://nvd.nist.gov/vuln/detail/CVE-2021-23987 external
https://www.mozilla.org/en-US/security/advisories… external
Acknowledgments
the Mozilla project
Mozilla Developers Abraruddin Khan and Omair
Abraruddin Khan and Omair
Samy Kamkar Ben Seri Gregory Vishnepolsky
Rob Wu
Alexis Beingessner Tyson Smith Julien Wajsberg Matthew Gregan
To clipboard 

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            "AppStream-8.2.0.Z.EUS:firefox-debugsource-0:78.9.0-1.el8_2.ppc64le",
            "AppStream-8.2.0.Z.EUS:firefox-debugsource-0:78.9.0-1.el8_2.s390x",
            "AppStream-8.2.0.Z.EUS:firefox-debugsource-0:78.9.0-1.el8_2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.