Heap-based buffer overflow in the yaml_parser_scan_uri_escapes function in LibYAML before 0.1.6 allows context-dependent attackers to execute arbitrary code via a long sequence of percent-encoded characters in a URI in a YAML file.
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-2525 Signed-off-by: Yue Tao <yue....@windriver.com> Signed-off-by: Kai Kang <kai.k...@windriver.com> --- .../libyaml/files/libyaml-CVE-2014-2525.patch | 42 ++++++++++++++++++++++ meta-oe/recipes-support/libyaml/libyaml_0.1.5.bb | 4 ++- 2 files changed, 45 insertions(+), 1 deletion(-) create mode 100644 meta-oe/recipes-support/libyaml/files/libyaml-CVE-2014-2525.patch diff --git a/meta-oe/recipes-support/libyaml/files/libyaml-CVE-2014-2525.patch b/meta-oe/recipes-support/libyaml/files/libyaml-CVE-2014-2525.patch new file mode 100644 index 0000000..2fdcba3 --- /dev/null +++ b/meta-oe/recipes-support/libyaml/files/libyaml-CVE-2014-2525.patch @@ -0,0 +1,42 @@ +Heap-based buffer overflow in the yaml_parser_scan_uri_escapes function +in LibYAML before 0.1.6 allows context-dependent attackers to execute +arbitrary code via a long sequence of percent-encoded characters in a +URI in a YAML file. + +Upstream-Status: Backport + +Signed-off-by: Kai Kang <kai.k...@windriver.com> +--- +diff --git a/src/scanner.c.old b/src/scanner.c +index a2e8619..c6cde3b 100644 +--- a/src/scanner.c.old ++++ b/src/scanner.c +@@ -2619,6 +2619,9 @@ yaml_parser_scan_tag_uri(yaml_parser_t *parser, int directive, + /* Check if it is a URI-escape sequence. */ + + if (CHECK(parser->buffer, '%')) { ++ if (!STRING_EXTEND(parser, string)) ++ goto error; ++ + if (!yaml_parser_scan_uri_escapes(parser, + directive, start_mark, &string)) goto error; + } +diff --git a/src/yaml_private.h.old b/src/yaml_private.h +index ed5ea66..d72acb4 100644 +--- a/src/yaml_private.h.old ++++ b/src/yaml_private.h +@@ -132,9 +132,12 @@ yaml_string_join( + (string).start = (string).pointer = (string).end = 0) + + #define STRING_EXTEND(context,string) \ +- (((string).pointer+5 < (string).end) \ ++ ((((string).pointer+5 < (string).end) \ + || yaml_string_extend(&(string).start, \ +- &(string).pointer, &(string).end)) ++ &(string).pointer, &(string).end)) ? \ ++ 1 : \ ++ ((context)->error = YAML_MEMORY_ERROR, \ ++ 0)) + + #define CLEAR(context,string) \ + ((string).pointer = (string).start, \ diff --git a/meta-oe/recipes-support/libyaml/libyaml_0.1.5.bb b/meta-oe/recipes-support/libyaml/libyaml_0.1.5.bb index c44eda4..1279541 100644 --- a/meta-oe/recipes-support/libyaml/libyaml_0.1.5.bb +++ b/meta-oe/recipes-support/libyaml/libyaml_0.1.5.bb @@ -7,7 +7,9 @@ SECTION = "libs/devel" LICENSE = "MIT" LIC_FILES_CHKSUM = "file://LICENSE;md5=6015f088759b10e0bc2bf64898d4ae17" -SRC_URI = "http://pyyaml.org/download/libyaml/yaml-${PV}.tar.gz"; +SRC_URI = "http://pyyaml.org/download/libyaml/yaml-${PV}.tar.gz \ + file://libyaml-CVE-2014-2525.patch \ + " SRC_URI[md5sum] = "24f6093c1e840ca5df2eb09291a1dbf1" SRC_URI[sha256sum] = "fa87ee8fb7b936ec04457bc044cd561155e1000a4d25029867752e543c2d3bef" -- 1.9.1 -- _______________________________________________ Openembedded-devel mailing list Openembedded-devel@lists.openembedded.org http://lists.openembedded.org/mailman/listinfo/openembedded-devel
