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ubuntuUbuntuUSN-5047-1
HistoryAug 19, 2021 - 12:00 a.m.

Firefox vulnerability

2021-08-1900:00:00
ubuntu.com
99
firefox web browser
http/3 response headers
header splitting attack
ubuntu 21.04
ubuntu 20.04 lts
ubuntu 18.04 esm

CVSS2

5.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS3

8.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

AI Score

8

Confidence

High

EPSS

0.002

Percentile

53.0%

Releases

  • Ubuntu 21.04
  • Ubuntu 20.04 LTS
  • Ubuntu 18.04 ESM

Packages

  • firefox - Mozilla Open Source web browser

Details

It was discovered that Firefox could be made to incorrectly accept
newlines in HTTP/3 response headers. If a user were tricked into
opening a specially crafted website, an attacker could exploit this
to conduct header splitting attacks.

OSVersionArchitecturePackageVersionFilename
Ubuntu21.04noarchfirefox< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-dbg< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-dev< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-geckodriver< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-af< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-an< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-ar< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-as< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-ast< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
Ubuntu21.04noarchfirefox-locale-az< 91.0.1+build1-0ubuntu0.21.04.1UNKNOWN
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CVSS2

5.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS3

8.1

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

AI Score

8

Confidence

High

EPSS

0.002

Percentile

53.0%