Gentoo: cyrus-sasl buffer overflow vulnerability
Insufficient buffer length checking in user name canonicalization may allow attacker to execute arbitrary code on servers using Cyrus SASL library.
Summary
- -------------------------------------------------------------------- GENTOO LINUX SECURITY ANNOUNCEMENT 200212-10 - -------------------------------------------------------------------- DATE : 2002-12-27 22:12 UTC
- --------------------------------------------------------------------
From advisory:
"Insufficient buffer length checking in user name canonicalization may allow attacker to execute arbitrary code on servers using Cyrus SASL library. Client side library also has the bug but since the user name is asked from the local user, there's probably not many applications that care about it, except maybe webmails and the like. This overflow only happens if default realm is set."
"LDAP authentication with saslauthd doesn't allocate enough memory when it needs to escape characters '*', '(', ')', '\' and '\0' in username and realm. This should be easily exploited with glibc's malloc implementation."
"Log writer might not have allocated memory for the trailing \0 in message. Probably hard to exploit, although you can affect the logging data with at least anonymous authentication."
Read the full advisory at http://marc.theaimsgroup.com/?l=bugtraq&m=103946297703402&w=2
SOLUTION
It is recommended that all Gentoo Linux users who are running dev-libs/cyrus-sasl-2.1.9 update their systems as follows:
emerge rsync emerge cyrus-sasl emerge clean
- -------------------------------------------------------------------- aliz@gentoo.org - GnuPG key is available at raker@gentoo.org - --------------------------------------------------------------------
Resolution
References
Availability
Concerns
Severity
PACKAGE : cyrus-sasl
SUMMARY : buffer overflows
EXPLOIT : remote
