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scp: disallow empty or current directory

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Obtained from:	OpenBSD scp.c 1.198
Security:	CVE-2018-20685
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Ed Maste 2019-01-15 15:35:14 +00:00
parent cd0c606fda
commit d366f891b1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=343043
1 changed files with 2 additions and 1 deletions
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3
crypto/openssh/scp.c
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@ -1106,7 +1106,8 @@ sink(int argc, char **argv)
SCREWUP("size out of range");
size = (off_t)ull;
if ((strchr(cp, '/') != NULL) || (strcmp(cp, "..") == 0)) {
if (*cp == '\0' || strchr(cp, '/') != NULL ||
strcmp(cp, ".") == 0 || strcmp(cp, "..") == 0) {
run_err("error: unexpected filename: %s", cp);
exit(1);
}