CVE Database


Impact: Important
Public: 2011-07-05
Bugzilla: 711419: CVE-2011-1526 krb5, krb5-appl: ftpd incorrect group privilege dropping (MITKRB5-SA-2011-005)
IAVA: 2011-B-0077


It was found that ftpd, a Kerberos-aware FTP server, did not properly drop privileges. On Red Hat Enterprise Linux 5, the ftpd daemon did not check for the potential failure of the krb5_setegid() function call. On systems where the set real, set effective, or set saved group ID system calls might fail, a remote FTP user could use this flaw to gain unauthorized read or write access to files that were owned by the root group.

Find out more about CVE-2011-1526 from the MITRE CVE dictionary and NIST NVD.


This issue was addressed in krb5-appl packages in Red Hat Enterprise Linux 6 via RHSA-2011:0920 and krb5 packages in Red Hat Enterprise Linux 5 via RHSA-2012:0306.
This issue is not planned to be addressed in Red Hat Enterprise Linux 4, where this issue was rated as having low security impact.

CVSS v2 metrics

Base Score: 5.5
Base Metrics: AV:N/AC:L/Au:S/C:P/I:P/A:N
Access Vector: Network
Access Complexity: Low
Authentication: Single Instance
Confidentiality Impact: Partial
Integrity Impact: Partial
Availability Impact: None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat security errata

Platform Errata Release Date
Red Hat Enterprise Linux version 5 (krb5) RHSA-2012:0306 February 21, 2012
Red Hat Enterprise Linux version 6 (krb5-appl) RHSA-2011:0920 July 05, 2011

External References


Red Hat would like to thank the MIT Kerberos project for reporting this issue. Upstream acknowledges Tim Zingelman as the original reporter.

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For clarification or corrections please contact the Red Hat Security Response Team.