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NetBSD ftpchroot Parsing Vulnerability
Solution: From the advisory: This problem affects only NetBSD-1.4.2 and versions of NetBSD-current between 19990930 and 19991212; it does not affect NetBSD-1.4.1 or earlier, or versions of NetBSD-current after 19991212 or before 19990930. If you do not need to use /etc/ftpchroot, you do not need to take any action. If you're running NetBSD-current fetched between the above dates, update to a newer version of NetBSD-current. If you're runing NetBSD-1.4.2, fetch the following patch, apply it to src/libexec/ftpd/ftpd.c using the patch(1) command, rebuild and reinstall ftpd, and kill off any existing FTP daemons (to ensure that any improperly granted access is revoked). ftp://ftp.NetBSD.ORG/pub/NetBSD/misc/security/patches/20000527-ftpd Since the patch is small, it is reproduced inline here: *** ftpd.c 1999/10/01 12:08:06 1.61.2.1 - --- ftpd.c 2000/05/11 10:14:37 1.61.2.2 *************** *** 489,496 **** if (glob == NULL || glob[0] == '#') continue; perm = strtok(NULL, " \t\n"); - - if (perm == NULL) - - continue; if (fnmatch(glob, name, 0) == 0) { if (perm != NULL && ((strcasecmp(perm, "allow") == 0) || - --- 489,494 ---- |
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