CVE-2017-9228 Amazon Linux Security Advisory for php56: ALAS-2017-871

Out-of-bounds heap write in bitset_set_range()
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A heap out-of-bounds write occurs in bitset_set_range() during regular expression compilation due to an uninitialized variable from an incorrect state transition. An incorrect state transition in parse_char_class() could create an execution path that leaves a critical local variable uninitialized until it's used as an index, resulting in an out-of-bounds write memory corruption. (CVE-2017-9228 )

Invalid pointer dereference in left_adjust_char_head()
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A SIGSEGV occurs in left_adjust_char_head() during regular expression compilation. Invalid handling of reg->dmax in forward_search_range() could result in an invalid pointer dereference, normally as an immediate denial-of-service condition. (CVE-2017-9229 )

Heap buffer overflow in next_state_val() during regular expression compilation
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A heap out-of-bounds write or read occurs in next_state_val() during regular expression compilation. Octal numbers larger than 0xff are not handled correctly in fetch_token() and fetch_token_in_cc(). A malformed regular expression containing an octal number in the form of '0'; would produce an invalid code point value larger than 0xff in next_state_val(), resulting in an out-of-bounds write memory corruption. (CVE-2017-9226 )

Out-of-bounds stack read in mbc_enc_len() during regular expression searching
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in mbc_enc_len() during regular expression searching. Invalid handling of reg>dmin in forward_search_range() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer. CVE-2017-9227

Out-of-bounds stack read in match_at() during regular expression searching
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in match_at() during regular expression searching. A logical error involving order of validation and access in match_at() could result in an out-of-bounds read from a stack buffer. (CVE-2017-9224 )

QID Detection Logic:
This authenticated QID verifies if the version of the following files is lesser than 5.6.31-1.134.amzn1: php56-ldap, php56-mcrypt, php56-devel, php56-gd, php56-recode, php56-pdo, php56-tidy, php56-intl, php56-imap, php56-fpm, php56-soap, php56-snmp, php56-pgsql, php56-xmlrpc, php56-process, php56-dbg, php56-embedded, php56-mssql, php56-dba, php56-debuginfo, php56, php56-mysqlnd, php56-gmp, php56-odbc, php56-mbstring, php56-bcmath, php56-pspell, php56-opcache, php56-cli, php56-common, php56-enchant, php56-xml

Allows unauthorized disclosure of information; allows unauthorized modification; allows disruption of service.

Please refer to Amazon advisory ALAS-2017-871 for affected packages and patching details, or update with your package manager.

Patch:
Following are links for downloading patches to fix the vulnerabilities:

ALAS-2017-871: Amazon Linux (php56 (5.6.31-1.134.amzn1) on i686)

ALAS-2017-871: Amazon Linux (php56 (5.6.31-1.134.amzn1) on x86_64)

ALAS-2017-871: Amazon Linux (php56 (5.6.31-1.134.amzn1) on src)