Improper Input Validation Affecting krb5-appl-servers package, versions *


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
1.37% (71st percentile)

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  • Snyk IDSNYK-CENTOS6-KRB5APPLSERVERS-2007653
  • published26 Jul 2021
  • disclosed2 Feb 2021

Introduced: 2 Feb 2021

CVE-2019-25017  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for Centos:6 krb5-appl-servers.

NVD Description

Note: Versions mentioned in the description apply only to the upstream krb5-appl-servers package and not the krb5-appl-servers package as distributed by Centos. See How to fix? for Centos:6 relevant fixed versions and status.

An issue was discovered in rcp in MIT krb5-appl through 1.0.3. Due to the rcp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the rcp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious rcp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the rcp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file). This issue is similar to CVE-2019-6111 and CVE-2019-7283. NOTE: MIT krb5-appl is not supported upstream but is shipped by a few Linux distributions. The affected code was removed from the supported MIT Kerberos 5 (aka krb5) product many years ago, at version 1.8.

CVSS Base Scores

version 3.1