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package/zziplib: fix CVE-2018-17828

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Directory traversal vulnerability in ZZIPlib 0.13.69 allows attackers to
overwrite arbitrary files via a .. (dot dot) in a zip file, because of
the function unzzip_cat in the bins/unzzipcat-mem.c file.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 401d18b2e9)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Fabrice Fontaine 2020-03-03 21:16:22 +01:00 committed by Peter Korsgaard
parent a2b9e4e7a7
commit 047c1879fc
2 changed files with 347 additions and 0 deletions
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344
package/zziplib/0004-Fix-issue-62-Remove-any-components-from-pathnames-of-extracte.patch Normal file
View File

@ -0,0 +1,344 @@
From 81dfa6b3e08f6934885ba5c98939587d6850d08e Mon Sep 17 00:00:00 2001
From: Josef Moellers <jmoellers@suse.de>
Date: Thu, 4 Oct 2018 14:21:48 +0200
Subject: [PATCH] Fix issue #62: Remove any "../" components from pathnames of
extracted files. [CVE-2018-17828]
[Retrieved from:
https://github.com/gdraheim/zziplib/commit/81dfa6b3e08f6934885ba5c98939587d6850d08e]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
bins/unzzipcat-big.c | 57 +++++++++++++++++++++++++++++++++++++++++++-
bins/unzzipcat-mem.c | 57 +++++++++++++++++++++++++++++++++++++++++++-
bins/unzzipcat-mix.c | 57 +++++++++++++++++++++++++++++++++++++++++++-
bins/unzzipcat-zip.c | 57 +++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 224 insertions(+), 4 deletions(-)
diff --git a/bins/unzzipcat-big.c b/bins/unzzipcat-big.c
index 982d262..88c4d65 100644
--- a/bins/unzzipcat-big.c
+++ b/bins/unzzipcat-big.c
@@ -53,6 +53,48 @@ static void unzzip_cat_file(FILE* disk, char* name, FILE* out)
}
}
+/*
+ * NAME: remove_dotdotslash
+ * PURPOSE: To remove any "../" components from the given pathname
+ * ARGUMENTS: path: path name with maybe "../" components
+ * RETURNS: Nothing, "path" is modified in-place
+ * NOTE: removing "../" from the path ALWAYS shortens the path, never adds to it!
+ * Also, "path" is not used after creating it.
+ * So modifying "path" in-place is safe to do.
+ */
+static inline void
+remove_dotdotslash(char *path)
+{
+ /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
+ char *dotdotslash;
+ int warned = 0;
+
+ dotdotslash = path;
+ while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
+ {
+ /*
+ * Remove only if at the beginning of the pathname ("../path/name")
+ * or when preceded by a slash ("path/../name"),
+ * otherwise not ("path../name..")!
+ */
+ if (dotdotslash == path || dotdotslash[-1] == '/')
+ {
+ char *src, *dst;
+ if (!warned)
+ {
+ /* Note: the first time through the pathname is still intact */
+ fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
+ warned = 1;
+ }
+ /* We cannot use strcpy(), as there "The strings may not overlap" */
+ for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
+ ;
+ }
+ else
+ dotdotslash +=3; /* skip this instance to prevent infinite loop */
+ }
+}
+
static void makedirs(const char* name)
{
char* p = strrchr(name, '/');
@@ -70,6 +112,16 @@ static void makedirs(const char* name)
static FILE* create_fopen(char* name, char* mode, int subdirs)
{
+ char *name_stripped;
+ FILE *fp;
+ int mustfree = 0;
+
+ if ((name_stripped = strdup(name)) != NULL)
+ {
+ remove_dotdotslash(name_stripped);
+ name = name_stripped;
+ mustfree = 1;
+ }
if (subdirs)
{
char* p = strrchr(name, '/');
@@ -79,7 +131,10 @@ static FILE* create_fopen(char* name, char* mode, int subdirs)
free (dir_name);
}
}
- return fopen(name, mode);
+ fp = fopen(name, mode);
+ if (mustfree)
+ free(name_stripped);
+ return fp;
}
diff --git a/bins/unzzipcat-mem.c b/bins/unzzipcat-mem.c
index 9bc966b..793bde8 100644
--- a/bins/unzzipcat-mem.c
+++ b/bins/unzzipcat-mem.c
@@ -58,6 +58,48 @@ static void unzzip_mem_disk_cat_file(ZZIP_MEM_DISK* disk, char* name, FILE* out)
}
}
+/*
+ * NAME: remove_dotdotslash
+ * PURPOSE: To remove any "../" components from the given pathname
+ * ARGUMENTS: path: path name with maybe "../" components
+ * RETURNS: Nothing, "path" is modified in-place
+ * NOTE: removing "../" from the path ALWAYS shortens the path, never adds to it!
+ * Also, "path" is not used after creating it.
+ * So modifying "path" in-place is safe to do.
+ */
+static inline void
+remove_dotdotslash(char *path)
+{
+ /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
+ char *dotdotslash;
+ int warned = 0;
+
+ dotdotslash = path;
+ while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
+ {
+ /*
+ * Remove only if at the beginning of the pathname ("../path/name")
+ * or when preceded by a slash ("path/../name"),
+ * otherwise not ("path../name..")!
+ */
+ if (dotdotslash == path || dotdotslash[-1] == '/')
+ {
+ char *src, *dst;
+ if (!warned)
+ {
+ /* Note: the first time through the pathname is still intact */
+ fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
+ warned = 1;
+ }
+ /* We cannot use strcpy(), as there "The strings may not overlap" */
+ for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
+ ;
+ }
+ else
+ dotdotslash +=3; /* skip this instance to prevent infinite loop */
+ }
+}
+
static void makedirs(const char* name)
{
char* p = strrchr(name, '/');
@@ -75,6 +117,16 @@ static void makedirs(const char* name)
static FILE* create_fopen(char* name, char* mode, int subdirs)
{
+ char *name_stripped;
+ FILE *fp;
+ int mustfree = 0;
+
+ if ((name_stripped = strdup(name)) != NULL)
+ {
+ remove_dotdotslash(name_stripped);
+ name = name_stripped;
+ mustfree = 1;
+ }
if (subdirs)
{
char* p = strrchr(name, '/');
@@ -84,7 +136,10 @@ static FILE* create_fopen(char* name, char* mode, int subdirs)
free (dir_name);
}
}
- return fopen(name, mode);
+ fp = fopen(name, mode);
+ if (mustfree)
+ free(name_stripped);
+ return fp;
}
static int unzzip_cat (int argc, char ** argv, int extract)
diff --git a/bins/unzzipcat-mix.c b/bins/unzzipcat-mix.c
index 91c2f00..73b6ed6 100644
--- a/bins/unzzipcat-mix.c
+++ b/bins/unzzipcat-mix.c
@@ -69,6 +69,48 @@ static void unzzip_cat_file(ZZIP_DIR* disk, char* name, FILE* out)
}
}
+/*
+ * NAME: remove_dotdotslash
+ * PURPOSE: To remove any "../" components from the given pathname
+ * ARGUMENTS: path: path name with maybe "../" components
+ * RETURNS: Nothing, "path" is modified in-place
+ * NOTE: removing "../" from the path ALWAYS shortens the path, never adds to it!
+ * Also, "path" is not used after creating it.
+ * So modifying "path" in-place is safe to do.
+ */
+static inline void
+remove_dotdotslash(char *path)
+{
+ /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
+ char *dotdotslash;
+ int warned = 0;
+
+ dotdotslash = path;
+ while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
+ {
+ /*
+ * Remove only if at the beginning of the pathname ("../path/name")
+ * or when preceded by a slash ("path/../name"),
+ * otherwise not ("path../name..")!
+ */
+ if (dotdotslash == path || dotdotslash[-1] == '/')
+ {
+ char *src, *dst;
+ if (!warned)
+ {
+ /* Note: the first time through the pathname is still intact */
+ fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
+ warned = 1;
+ }
+ /* We cannot use strcpy(), as there "The strings may not overlap" */
+ for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
+ ;
+ }
+ else
+ dotdotslash +=3; /* skip this instance to prevent infinite loop */
+ }
+}
+
static void makedirs(const char* name)
{
char* p = strrchr(name, '/');
@@ -86,6 +128,16 @@ static void makedirs(const char* name)
static FILE* create_fopen(char* name, char* mode, int subdirs)
{
+ char *name_stripped;
+ FILE *fp;
+ int mustfree = 0;
+
+ if ((name_stripped = strdup(name)) != NULL)
+ {
+ remove_dotdotslash(name_stripped);
+ name = name_stripped;
+ mustfree = 1;
+ }
if (subdirs)
{
char* p = strrchr(name, '/');
@@ -95,7 +147,10 @@ static FILE* create_fopen(char* name, char* mode, int subdirs)
free (dir_name);
}
}
- return fopen(name, mode);
+ fp = fopen(name, mode);
+ if (mustfree)
+ free(name_stripped);
+ return fp;
}
static int unzzip_cat (int argc, char ** argv, int extract)
diff --git a/bins/unzzipcat-zip.c b/bins/unzzipcat-zip.c
index 2810f85..7f7f3fa 100644
--- a/bins/unzzipcat-zip.c
+++ b/bins/unzzipcat-zip.c
@@ -69,6 +69,48 @@ static void unzzip_cat_file(ZZIP_DIR* disk, char* name, FILE* out)
}
}
+/*
+ * NAME: remove_dotdotslash
+ * PURPOSE: To remove any "../" components from the given pathname
+ * ARGUMENTS: path: path name with maybe "../" components
+ * RETURNS: Nothing, "path" is modified in-place
+ * NOTE: removing "../" from the path ALWAYS shortens the path, never adds to it!
+ * Also, "path" is not used after creating it.
+ * So modifying "path" in-place is safe to do.
+ */
+static inline void
+remove_dotdotslash(char *path)
+{
+ /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
+ char *dotdotslash;
+ int warned = 0;
+
+ dotdotslash = path;
+ while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
+ {
+ /*
+ * Remove only if at the beginning of the pathname ("../path/name")
+ * or when preceded by a slash ("path/../name"),
+ * otherwise not ("path../name..")!
+ */
+ if (dotdotslash == path || dotdotslash[-1] == '/')
+ {
+ char *src, *dst;
+ if (!warned)
+ {
+ /* Note: the first time through the pathname is still intact */
+ fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
+ warned = 1;
+ }
+ /* We cannot use strcpy(), as there "The strings may not overlap" */
+ for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
+ ;
+ }
+ else
+ dotdotslash +=3; /* skip this instance to prevent infinite loop */
+ }
+}
+
static void makedirs(const char* name)
{
char* p = strrchr(name, '/');
@@ -86,6 +128,16 @@ static void makedirs(const char* name)
static FILE* create_fopen(char* name, char* mode, int subdirs)
{
+ char *name_stripped;
+ FILE *fp;
+ int mustfree = 0;
+
+ if ((name_stripped = strdup(name)) != NULL)
+ {
+ remove_dotdotslash(name_stripped);
+ name = name_stripped;
+ mustfree = 1;
+ }
if (subdirs)
{
char* p = strrchr(name, '/');
@@ -95,7 +147,10 @@ static FILE* create_fopen(char* name, char* mode, int subdirs)
free (dir_name);
}
}
- return fopen(name, mode);
+ fp = fopen(name, mode);
+ if (mustfree)
+ free(name_stripped);
+ return fp;
}
static int unzzip_cat (int argc, char ** argv, int extract)

3
package/zziplib/zziplib.mk
View File

@ -15,6 +15,9 @@ ZZIPLIB_INSTALL_STAGING = YES
# 0003-One-more-free-to-avoid-memory-leak.patch
ZZIPLIB_IGNORE_CVES += CVE-2018-16548
# 0004-Fix-issue-62-Remove-any-components-from-pathnames-of-extracte.patch
ZZIPLIB_IGNORE_CVES += CVE-2018-17828
ZZIPLIB_DEPENDENCIES = host-pkgconf host-python zlib
# zziplib is not python3 friendly, so force the python interpreter