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bcfd1d7685
GNU patch through 2.7.6 is vulnerable to OS shell command injection that can be exploited by opening a crafted patch file that contains an ed style diff payload with shell metacharacters. The ed editor does not need to be present on the vulnerable system. This is different from CVE-2018-1000156. https://nvd.nist.gov/vuln/detail/CVE-2019-13638 Signed-off-by: Russell Senior <russell@personaltelco.net>
39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From 3fcd042d26d70856e826a42b5f93dc4854d80bf0 Mon Sep 17 00:00:00 2001
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From: Andreas Gruenbacher <agruen@gnu.org>
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Date: Fri, 6 Apr 2018 19:36:15 +0200
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Subject: Invoke ed directly instead of using the shell
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* src/pch.c (do_ed_script): Invoke ed directly instead of using a shell
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command to avoid quoting vulnerabilities.
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---
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src/pch.c | 6 ++----
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1 file changed, 2 insertions(+), 4 deletions(-)
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diff --git a/src/pch.c b/src/pch.c
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index 4fd5a05..16e001a 100644
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--- a/src/pch.c
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+++ b/src/pch.c
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@@ -2459,9 +2459,6 @@ do_ed_script (char const *inname, char const *outname,
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*outname_needs_removal = true;
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copy_file (inname, outname, 0, exclusive, instat.st_mode, true);
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}
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- sprintf (buf, "%s %s%s", editor_program,
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- verbosity == VERBOSE ? "" : "- ",
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- outname);
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fflush (stdout);
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pid = fork();
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@@ -2470,7 +2467,8 @@ do_ed_script (char const *inname, char const *outname,
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else if (pid == 0)
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{
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dup2 (tmpfd, 0);
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- execl ("/bin/sh", "sh", "-c", buf, (char *) 0);
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+ assert (outname[0] != '!' && outname[0] != '-');
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+ execlp (editor_program, editor_program, "-", outname, (char *) NULL);
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_exit (2);
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}
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else
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--
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cgit v1.0-41-gc330
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