CVE-2017-12883

Buffer overflow in the S_grok_bslash_N function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to disclose sensitive information or cause a denial of service (application crash) via a crafted regular expression with an invalid '\N{U+...}' escape.

Buffer overflow in the S_grok_bslash_N function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to disclose sensitive information or cause a denial of service (application crash) via a crafted regular expression with an invalid '\N{U+...}' escape.

Buffer overflow in the S_grok_bslash_N function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to disclose sensitive information or cause a denial of service (application crash) via a crafted regular expression with an invalid '\N{U+...}' escape.

John Lightsey and Todd Rinaldo reported that the opportunistic loading of optional modules can make many programs unintentionally load code from the current working directory (which might be changed to another directory without the user realising) and potentially leading to privilege escalation (CVE-2016-1238).

The cPanel Security Team reported a time of check to time of use (TOCTTOU) race condition flaw in File::Path, a core module from Perl to create or remove directory trees. An attacker can take advantage of this flaw to set the mode on an attacker-chosen file to a attacker-chosen value (CVE-2017-6512).

Jakub Wilk reported a heap buffer overflow flaw in the regular expression compiler, allowing a remote attacker to cause a denial of service via a specially crafted regular expression with the case-insensitive modifier (CVE-2017-12837).

Jakub Wilk reported a buffer over-read flaw in the regular expression parser, allowing a remote attacker to cause a denial of service or information leak (CVE-2017-12883).

The perl-libintl-perl, perl-MIME-Charset, perl-MIME-EncWords, perl-Module-Build, perl-Sys-Syslog, and perl-Unicode-LineBreak packages have been patched and the perl-Module-Load-Conditional and perl-Net-DNS packages have been updated to fix CVE-2016-1238 as well.

The perl-File-Path package has also been patched to fix CVE-2017-6512.

Jakub Wilk reported a heap buffer overflow flaw in the regular expression compiler, allowing a remote attacker to cause a denial of service via a specially crafted regular expression with the case-insensitive modifier (CVE-2017-12837).

Jakub Wilk reported a buffer over-read flaw in the regular expression parser, allowing a remote attacker to cause a denial of service or information leak (CVE-2017-12883).

These are all security issues fixed in the perl-32bit-5.34.0-1.1 package on the GA media of openSUSE Tumbleweed.

This update for perl fixes the following issues:

Security issues fixed:

• CVE-2017-12837: Heap-based buffer overflow in the S_regatom function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to cause a denial of service (out-of-bounds write) via a regular expression with a '\N{}' escape and the case-insensitive modifier. (bnc#1057724)
• CVE-2017-12883: Buffer overflow in the S_grok_bslash_N function in regcomp.c in Perl 5 before 5.24.3-RC1 and 5.26.x before 5.26.1-RC1 allows remote attackers to disclose sensitive information or cause a denial of service (application crash) via a crafted regular expression with an invalid '\N{U+...}' escape. (bnc#1057721)
• CVE-2017-6512: Race condition in the rmtree and remove_tree functions in the File-Path module before 2.13 for Perl allows attackers to set the mode on arbitrary files via vectors involving directory-permission loosening logic. (bnc#1047178)

Bug fixes:

• backport set_capture_string changes from upstream (bsc#999735)
• reformat baselibs.conf as source validator workaround

Jakub Wilk discovered that Perl incorrectly handled certain regular expressions. An attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2017-12837, CVE-2017-12883)