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SUSE:SLE-15-SP7:GA
openssh.21986
openssh-CVE-2019-6111-scp-client-wildcard.patch
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File openssh-CVE-2019-6111-scp-client-wildcard.patch of Package openssh.21986
commit 391ffc4b9d31fa1f4ad566499fef9176ff8a07dc Author: djm@openbsd.org <djm@openbsd.org> Date: Sat Jan 26 22:41:28 2019 +0000 upstream: check in scp client that filenames sent during remote->local directory copies satisfy the wildcard specified by the user. This checking provides some protection against a malicious server sending unexpected filenames, but it comes at a risk of rejecting wanted files due to differences between client and server wildcard expansion rules. For this reason, this also adds a new -T flag to disable the check. reported by Harry Sintonen fix approach suggested by markus@; has been in snaps for ~1wk courtesy deraadt@ OpenBSD-Commit-ID: 00f44b50d2be8e321973f3c6d014260f8f7a8eda Index: openssh-7.6p1/scp.1 =================================================================== --- openssh-7.6p1.orig/scp.1 2019-03-12 14:33:56.671370275 +0100 +++ openssh-7.6p1/scp.1 2019-03-12 14:38:38.488948465 +0100 @@ -19,7 +19,7 @@ .Sh SYNOPSIS .Nm scp .Bk -words -.Op Fl 346BCpqrv +.Op Fl 346BCpqrTv .Op Fl c Ar cipher .Op Fl F Ar ssh_config .Op Fl i Ar identity_file @@ -202,6 +202,16 @@ to use for the encrypted connection. The program must understand .Xr ssh 1 options. +.It Fl T +Disable strict filename checking. +By default when copying files from a remote host to a local directory +.Nm +checks that the received filenames match those requested on the command-line +to prevent the remote end from sending unexpected or unwanted files. +Because of differences in how various operating systems and shells interpret +filename wildcards, these checks may cause wanted files to be rejected. +This option disables these checks at the expense of fully trusting that +the server will not send unexpected filenames. .It Fl v Verbose mode. Causes Index: openssh-7.6p1/scp.c =================================================================== --- openssh-7.6p1.orig/scp.c 2019-03-12 14:38:38.196946823 +0100 +++ openssh-7.6p1/scp.c 2019-03-12 14:38:38.492948488 +0100 @@ -94,6 +94,7 @@ #include <dirent.h> #include <errno.h> #include <fcntl.h> +#include <fnmatch.h> #include <limits.h> #include <locale.h> #include <pwd.h> @@ -357,14 +358,14 @@ void verifydir(char *); struct passwd *pwd; uid_t userid; int errs, remin, remout; -int pflag, iamremote, iamrecursive, targetshouldbedirectory; +int Tflag, pflag, iamremote, iamrecursive, targetshouldbedirectory; #define CMDNEEDS 64 char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */ int response(void); void rsource(char *, struct stat *); -void sink(int, char *[]); +void sink(int, char *[], const char *); void source(int, char *[]); void tolocal(int, char *[]); void toremote(char *, int, char *[]); @@ -401,8 +402,9 @@ main(int argc, char **argv) addargs(&args, "-oPermitLocalCommand=no"); addargs(&args, "-oClearAllForwardings=yes"); - fflag = tflag = 0; - while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1) + fflag = Tflag = tflag = 0; + while ((ch = getopt(argc, argv, + "dfl:prtTvBCc:i:P:q12346S:o:F:J:")) != -1) { switch (ch) { /* User-visible flags. */ case '1': @@ -482,9 +484,13 @@ main(int argc, char **argv) setmode(0, O_BINARY); #endif break; + case 'T': + Tflag = 1; + break; default: usage(); } + } argc -= optind; argv += optind; @@ -515,7 +521,7 @@ main(int argc, char **argv) } if (tflag) { /* Receive data. */ - sink(argc, argv); + sink(argc, argv, NULL); exit(errs != 0); } if (argc < 2) @@ -756,7 +762,7 @@ tolocal(int argc, char **argv) continue; } free(bp); - sink(1, argv + argc - 1); + sink(1, argv + argc - 1, src); (void) close(remin); remin = remout = -1; } @@ -929,7 +935,7 @@ rsource(char *name, struct stat *statp) (sizeof(type) != 4 && sizeof(type) != 8)) void -sink(int argc, char **argv) +sink(int argc, char **argv, const char *src) { static BUF buffer; struct stat stb; @@ -945,6 +951,7 @@ sink(int argc, char **argv) unsigned long long ull; int setimes, targisdir, wrerrno = 0; char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048]; + char *src_copy = NULL, *restrict_pattern = NULL; struct timeval tv[2]; #define atime tv[0] @@ -969,6 +976,17 @@ sink(int argc, char **argv) (void) atomicio(vwrite, remout, "", 1); if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode)) targisdir = 1; + if (src != NULL && !iamrecursive && !Tflag) { + /* + * Prepare to try to restrict incoming filenames to match + * the requested destination file glob. + */ + if ((src_copy = strdup(src)) == NULL) + fatal("strdup failed"); + if ((restrict_pattern = strrchr(src_copy, '/')) != NULL) { + *restrict_pattern++ = '\0'; + } + } for (first = 1;; first = 0) { cp = buf; if (atomicio(read, remin, cp, 1) != 1) @@ -1071,6 +1089,9 @@ sink(int argc, char **argv) run_err("error: unexpected filename: %s", cp); exit(1); } + if (restrict_pattern != NULL && + fnmatch(restrict_pattern, cp, 0) != 0) + SCREWUP("filename does not match request"); if (targisdir) { static char *namebuf; static size_t cursize; @@ -1108,7 +1129,7 @@ sink(int argc, char **argv) goto bad; } vect[0] = xstrdup(np); - sink(1, vect); + sink(1, vect, src); if (setimes) { setimes = 0; if (utimes(vect[0], tv) < 0) @@ -1276,7 +1297,7 @@ void usage(void) { (void) fprintf(stderr, - "usage: scp [-346BCpqrv] [-c cipher] [-F ssh_config] [-i identity_file]\n" + "usage: scp [-346BCpqrTv] [-c cipher] [-F ssh_config] [-i identity_file]\n" " [-l limit] [-o ssh_option] [-P port] [-S program]\n" " [[user@]host1:]file1 ... [[user@]host2:]file2\n"); exit(1);
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