An error in the handling of user names of Linux-PAM might allow remote attackers to cause a Denial of Service or escalate privileges.
|Package||sys-libs/pam on all architectures|
|Affected versions||< 1.0.4|
|Unaffected versions||>= 1.0.4|
Linux-PAM (Pluggable Authentication Modules) is an architecture allowing the separation of the development of privilege granting software from the development of secure and appropriate authentication schemes.
Marcus Granado repoted that Linux-PAM does not properly handle user names that contain Unicode characters. This is related to integer signedness errors in the pam_StrTok() function in libpam/pam_misc.c.
A remote attacker could exploit this vulnerability to cause a Denial of Service. A remote authenticated attacker could exploit this vulnerability to log in to a system with the account of a user that has a similar user name, but with non-ASCII characters.
There is no known workaround at this time.
All Linux-PAM users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-libs/pam-1.0.4"
September 07, 2009
September 07, 2009: 01