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ubuntuUbuntuUSN-4994-2
HistoryJun 21, 2021 - 12:00 a.m.

Apache HTTP Server vulnerabilities

2021-06-2100:00:00
ubuntu.com
121

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.2 High

AI Score

Confidence

Low

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.689 Medium

EPSS

Percentile

98.0%

Releases

  • Ubuntu 16.04 ESM
  • Ubuntu 14.04 ESM

Packages

  • apache2 - Apache HTTP server

Details

USN-4994-1 fixed several vulnerabilities in Apache. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Antonio Morales discovered that the Apache mod_auth_digest module
incorrectly handled certain Digest nonces. A remote attacker could possibly
use this issue to cause Apache to crash, resulting in a denial of service.
(CVE-2020-35452)

Antonio Morales discovered that the Apache mod_session module incorrectly
handled certain Cookie headers. A remote attacker could possibly use this
issue to cause Apache to crash, resulting in a denial of service.
(CVE-2021-26690)

Christophe Jaillet discovered that the Apache mod_session module
incorrectly handled certain SessionHeader values. A remote attacker could
use this issue to cause Apache to crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2021-26691)

Christoph Anton Mitterer discovered that the new MergeSlashes configuration
option resulted in unexpected behaviour in certain situations.
(CVE-2021-30641)

OSVersionArchitecturePackageVersionFilename
Ubuntu16.04noarchapache2< 2.4.18-2ubuntu3.17+esm1UNKNOWN
Ubuntu16.04noarchapache2< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-bin< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-bin-dbgsym< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-data< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-dbg< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-dbgsym< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-dev< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-dev-dbgsym< 2.4.18-2ubuntu3.17UNKNOWN
Ubuntu16.04noarchapache2-doc< 2.4.18-2ubuntu3.17UNKNOWN
Rows per page:
1-10 of 391

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.2 High

AI Score

Confidence

Low

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.689 Medium

EPSS

Percentile

98.0%