CVE-2011-1526: Medium severity mit kerberos 5 application vulnerability
ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script.
Other sources
It was found that the kerberized FTP server did not properly check for the failure to set its effective group identifier (GID). A remote, authenticated FTP user could use this flaw to gain unauthorized read or write access to files whose group owner was the initial effective GID of the FTP daemon process.
References: [1] http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-005.txt (not public yet) [2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1526
Upstream patch: [3] http://web.mit.edu/kerberos/advisories/2011-005-patch.txt
Acknowledgements:
Red Hat would like to thank the MIT Kerberos project for reporting this issue. Upstream acknowledges Tim Zingelman as the original reporter.
— Red Hat
Affected Software
Remediation
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2011-1526?
CVE-2011-1526 has a medium severity rating due to its impact on file access and group access restrictions.
How do I fix CVE-2011-1526?
To fix CVE-2011-1526, upgrade to MIT Kerberos Version 5 Applications 1.0.2 or later.
Who is affected by CVE-2011-1526?
CVE-2011-1526 affects users of MIT Kerberos Version 5 Applications 1.0.1 and earlier, as well as specific versions of Debian and Fedora distributions mentioned in the vulnerability report.
What does CVE-2011-1526 allow remote authenticated users to do?
CVE-2011-1526 allows remote authenticated users to bypass intended group access restrictions, enabling them to create, overwrite, delete, or read files.
Is there a patch available for CVE-2011-1526?
Yes, a patch for CVE-2011-1526 is available and can be applied by updating to the recommended software version.