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Multiple Linux Vendor gpm Setgid Vulnerability
Solution: A fix has been released for SuSE Linux. It is available at: 6.1: ftp://ftp.suse.com/pub/suse/i386/update/6.1/ap1/gpm.rpm 6.2: ftp://ftp.suse.com/pub/suse/i386/update/6.2/ap1/gpm.rpm 6.3: ftp://ftp.suse.com/pub/suse/i386/update/6.3/ap1/gpm.rpm The author has indicated a fix will be present in versions 1.19.1, which will be the final release by the author. A temporary solution is to disable gpm-root. A patch to fix the problem in gpm-1.19.0 was made available: diff -u -r -N ../gpm-1.19.0.orig/doc/doc.gpm ./doc/doc.gpm --- ../gpm-1.19.0.orig/doc/doc.gpm Mon Feb 7 23:34:00 2000 +++ ./doc/doc.gpm Thu Mar 23 14:37:43 2000 @@ -1969,6 +1969,12 @@ be broken by this daemon. Things should be sufficiently secure, but if you find a hole please tell me about it. +@item -r + Always run commands as root instead of the user who owns the tty. + Implies -u. This is useful for those system administrators who + put menu entries to reboot or halt the system, start or stop + xdm, change keyboard layout etc. + @item -D Do not automatically enter background operation when started, and log messages to the standard error stream, not the syslog diff -u -r -N ../gpm-1.19.0.orig/gpm-root.y ./gpm-root.y --- ../gpm-1.19.0.orig/gpm-root.y Thu Oct 7 20:15:18 1999 +++ ./gpm-root.y Thu Mar 23 14:37:43 2000 @@ -41,6 +41,7 @@ #include <sys/syslog.h> #include <signal.h> /* sigaction() */ #include <pwd.h> /* pwd entries */ +#include <grp.h> /* initgroups() */ #include <sys/kd.h> /* KDGETMODE */ #include <sys/stat.h> /* fstat() */ #include <sys/utsname.h> /* uname() */ @@ -117,6 +118,7 @@ int opt_mod = 4; /* control */ int opt_buf = 0; /* ask the kernel about it */ int opt_user = 1; /* allow user cfg files */ +int opt_root = 0; /* run everything as root */ @@ -447,6 +449,7 @@ void f__fix(struct passwd *pass) { setgid(pass->pw_gid); + initgroups(pass->pw_name, pass->pw_gid); setuid(pass->pw_uid); setenv("HOME", pass->pw_dir, 1); setenv("LOGNAME", pass->pw_name,1); @@ -539,7 +542,7 @@ return 1; case 0: - setuid(uid); + if (opt_root) uid=0; pass=getpwuid(uid); if (!pass) exit(1); f__fix(pass); @@ -926,6 +929,7 @@ printf(" Valid options are\n" " -m <number-or-name> modifier to use\n" " -u inhibit user configuration files\n" + " -r run commands as root\n" " -D don't auto-background and run as daemon\n" " -V <verbosity-delta> increase amount of logged messages\n" ); @@ -971,12 +975,13 @@ int opt; gpm_log_daemon = 1; - while ((opt = getopt(argc, argv,"m:uDV::")) != -1) + while ((opt = getopt(argc, argv,"m:urDV::")) != -1) { switch (opt) { case 'm': opt_mod=getmask(optarg, tableMod); break; case 'u': opt_user=0; break; + case 'r': opt_root=1; opt_user=0; break; case 'D': gpm_log_daemon = 0; break; case 'V': gpm_debug_level += (0 == optarg ? 1 : strtol(optarg, 0, 0)); A fix has been made available in gpm-1.19.2. ------------------------------------------------------------- Turbo Linux users can use the following fix: Update the packages from our ftp server by running the following command for each package: rpm -Fvh ftp_path_to_filename Where ftp_path_to_filename is the following: ftp://ftp.turbolinux.com/pub/updates/6.0/security/gpm-1.19.2-5.i386.rpm ftp://ftp.turbolinux.com/pub/updates/6.0/security/gpm-devel-1.19.2-5.i386.rpm Alessandro Rubini gpm 1.18.1
Alessandro Rubini gpm 1.19
SuSE Linux 5.3
SuSE Linux 6.1
SuSE Linux 6.2
SuSE Linux 6.3
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