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7bfdb02528
Fixes CVE-2021-36369 https://github.com/mkj/dropbear/releases/tag/DROPBEAR_2022.82
40 lines
1.3 KiB
Diff
40 lines
1.3 KiB
Diff
diff --git a/svr-chansession.c b/svr-chansession.c
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index 9ae2e60..2db7598 100644
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--- a/svr-chansession.c
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+++ b/svr-chansession.c
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@@ -948,6 +948,8 @@ static void addchildpid(struct ChanSess *chansess, pid_t pid) {
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static void execchild(const void *user_data) {
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const struct ChanSess *chansess = user_data;
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char *usershell = NULL;
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+ const char *path = (getuid() == 0) ? DEFAULT_ROOT_PATH : DEFAULT_PATH;
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+ const char *ldpath = NULL;
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char *cp = NULL;
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char *envcp = getenv("LANG");
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if (envcp != NULL) {
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@@ -965,6 +967,11 @@ static void execchild(const void *user_data) {
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seedrandom();
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#endif
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+ if (getenv("PATH")) {
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+ path = getenv("PATH");
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+ }
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+ ldpath = getenv("LD_LIBRARY_PATH");
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+
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/* clear environment if -e was not set */
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/* if we're debugging using valgrind etc, we need to keep the LD_PRELOAD
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* etc. This is hazardous, so should only be used for debugging. */
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@@ -1012,10 +1019,9 @@ static void execchild(const void *user_data) {
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addnewvar("LOGNAME", ses.authstate.pw_name);
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addnewvar("HOME", ses.authstate.pw_dir);
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addnewvar("SHELL", get_user_shell());
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- if (getuid() == 0) {
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- addnewvar("PATH", DEFAULT_ROOT_PATH);
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- } else {
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- addnewvar("PATH", DEFAULT_PATH);
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+ addnewvar("PATH", path);
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+ if (ldpath != NULL) {
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+ addnewvar("LD_LIBRARY_PATH", ldpath);
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}
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if (cp != NULL) {
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addnewvar("LANG", cp);
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