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Fixes CVE-2017-5618 (privilege escalation via opening the logfile when
screen is installed setuid root):
https://savannah.gnu.org/bugs/?50142
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5618
This patch reverts the upstream commit that introduced the bug:
https://git.savannah.gnu.org/cgit/screen.git/commit/?id=5460f5d28c01a9a58e021eb1dffef2965e629d58
From f55b0cc29a0ac2a1c54e8a5e886b7393edd4a76c Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Sat, 11 Feb 2017 22:40:24 -0500
Subject: [PATCH] Revert "adding permissions check for the logfile name"
This reverts commit 5460f5d28c01a9a58e021eb1dffef2965e629d58.
---
src/screen.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/src/screen.c b/src/screen.c
index 64650e9..283c305 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -673,12 +673,6 @@ int main(int ac, char** av)
Panic(0, "-L: logfile name can not start with \"-\" symbol");
if (strlen(screenlogfile) > PATH_MAX)
Panic(0, "-L: logfile name too long. (max. %d char)", PATH_MAX);
-
- FILE *w_check;
- if ((w_check = fopen(screenlogfile, "w")) == NULL)
- Panic(0, "-L: logfile name access problem");
- else
- fclose(w_check);
}
nwin_options.Lflag = 1;
break;
--
2.11.1
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