diff options
Diffstat (limited to 'meta/recipes-extended/ghostscript/ghostscript/CVE-2023-28879.patch')
| -rw-r--r-- | meta/recipes-extended/ghostscript/ghostscript/CVE-2023-28879.patch | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/meta/recipes-extended/ghostscript/ghostscript/CVE-2023-28879.patch b/meta/recipes-extended/ghostscript/ghostscript/CVE-2023-28879.patch new file mode 100644 index 0000000000..852f2459f7 --- /dev/null +++ b/meta/recipes-extended/ghostscript/ghostscript/CVE-2023-28879.patch @@ -0,0 +1,54 @@ +From 37ed5022cecd584de868933b5b60da2e995b3179 Mon Sep 17 00:00:00 2001 +From: Ken Sharp <ken.sharp@artifex.com> +Date: Fri, 24 Mar 2023 13:19:57 +0000 +Subject: [PATCH] Graphics library - prevent buffer overrun in (T)BCP encoding + +Bug #706494 "Buffer Overflow in s_xBCPE_process" + +As described in detail in the bug report, if the write buffer is filled +to one byte less than full, and we then try to write an escaped +character, we overrun the buffer because we don't check before +writing two bytes to it. + +This just checks if we have two bytes before starting to write an +escaped character and exits if we don't (replacing the consumed byte +of the input). + +Up for further discussion; why do we even permit a BCP encoding filter +anyway ? I think we should remove this, at least when SAFER is true. + +Upstream-Status: Backport [https://git.ghostscript.com/?p=ghostpdl.git;h=37ed5022cecd584de868933b5b60da2e995b3179] +CVE: CVE-2023-28879 +Signed-off-by: Vijay Anusuri <vanusuri@mvista.com> +--- + base/sbcp.c | 10 +++++++++- + 1 file changed, 9 insertions(+), 1 deletion(-) + +diff --git a/base/sbcp.c b/base/sbcp.c +index 6b0383c..90784b5 100644 +--- a/base/sbcp.c ++++ b/base/sbcp.c +@@ -1,4 +1,4 @@ +-/* Copyright (C) 2001-2019 Artifex Software, Inc. ++/* Copyright (C) 2001-2023 Artifex Software, Inc. + All Rights Reserved. + + This software is provided AS-IS with no warranty, either express or +@@ -50,6 +50,14 @@ s_xBCPE_process(stream_state * st, stream_cursor_read * pr, + byte ch = *++p; + + if (ch <= 31 && escaped[ch]) { ++ /* Make sure we have space to store two characters in the write buffer, ++ * if we don't then exit without consuming the input character, we'll process ++ * that on the next time round. ++ */ ++ if (pw->limit - q < 2) { ++ p--; ++ break; ++ } + if (p == rlimit) { + p--; + break; +-- +2.25.1 + |