Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2021-42550

Deserialization of Untrusted Data

Published: Dec 16, 2021 | Modified: Nov 21, 2024
CVSS 3.x
6.6
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
8.5 HIGH
AV:N/AC:M/Au:S/C:C/I:C/A:C
RedHat/V2
RedHat/V3
6.6 MODERATE
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-42550
CWEhttps://cwe.mitre.org/data/definitions/502.html

In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

NameVendorStart VersionEnd Version
LogbackQos*1.2.7 (including)
LogbackQos1.3.0-alpha0 (including)1.3.0-alpha0 (including)
LogbackQos1.3.0-alpha1 (including)1.3.0-alpha1 (including)
LogbackQos1.3.0-alpha10 (including)1.3.0-alpha10 (including)
LogbackQos1.3.0-alpha2 (including)1.3.0-alpha2 (including)
LogbackQos1.3.0-alpha3 (including)1.3.0-alpha3 (including)
LogbackQos1.3.0-alpha4 (including)1.3.0-alpha4 (including)
LogbackQos1.3.0-alpha5 (including)1.3.0-alpha5 (including)
LogbackQos1.3.0-alpha6 (including)1.3.0-alpha6 (including)
LogbackQos1.3.0-alpha7 (including)1.3.0-alpha7 (including)
LogbackQos1.3.0-alpha8 (including)1.3.0-alpha8 (including)
LogbackQos1.3.0-alpha9 (including)1.3.0-alpha9 (including)
Red Hat Fuse 7.11RedHatlogback-classic*
Red Hat Satellite 6.11 for RHEL 7RedHatcandlepin-0:4.1.13-1.el7sat*
Red Hat Satellite 6.11 for RHEL 8RedHatcandlepin-0:4.1.13-1.el8sat*
RHDM 7.12.1RedHatlogback-classic*
RHPAM 7.12.1RedHatlogback-classic*
LogbackUbuntubionic*
LogbackUbuntuesm-apps/bionic*
LogbackUbuntuesm-apps/focal*
LogbackUbuntuesm-apps/xenial*
LogbackUbuntufocal*
LogbackUbuntuhirsute*
LogbackUbuntuimpish*
LogbackUbuntukinetic*
LogbackUbuntulunar*
LogbackUbuntumantic*
LogbackUbuntutrusty*
LogbackUbuntuupstream*
LogbackUbuntuxenial*

Potential Mitigations

  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

References

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