-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-3628-1 security@xxxxxxxxxx https://www.debian.org/security/ Salvatore Bonaccorso July 25, 2016 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : perl CVE ID : CVE-2016-1238 CVE-2016-6185 Debian Bug : 829578 Multiple vulnerabilities were discovered in the implementation of the Perl programming language. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2016-1238 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, as demonstrated in Debian with certain combinations of installed packages. The problem relates to Perl loading modules from the includes directory array ("@INC") in which the last element is the current directory ("."). That means that, when "perl" wants to load a module (during first compilation or during lazy loading of a module in run- time), perl will look for the module in the current directory at the end, since '.' is the last include directory in its array of include directories to seek. The issue is with requiring libraries that are in "." but are not otherwise installed. With this update several modules which are known to be vulnerable are updated to not load modules from current directory. Additionally the update allows configurable removal of "." from @INC in /etc/perl/sitecustomize.pl for a transitional period. It is recommended to enable this setting if the possible breakage for a specific site has been evaluated. Problems in packages provided in Debian resulting from the switch to the removal of '.' from @INC should be reported to the Perl maintainers at perl@xxxxxxxxxxxxxxxxxxx . It is planned to switch to the default removal of '.' in @INC in a subsequent update to perl via a point release if possible, and in any case for the upcoming stable release Debian 9 (stretch). CVE-2016-6185 It was discovered that XSLoader, a core module from Perl to dynamically load C libraries into Perl code, could load shared library from incorrect location. XSLoader uses caller() information to locate the .so file to load. This can be incorrect if XSLoader::load() is called in a string eval. An attacker can take advantage of this flaw to execute arbitrary code. For the stable distribution (jessie), these problems have been fixed in version 5.20.2-3+deb8u6. Additionally this update includes the following updated packages to address optional module loading vulnerabilities related to CVE-2016-1238, or to address build failures which occur when '.' is removed from @INC: - cdbs 0.4.130+deb8u1 - debhelper 9.20150101+deb8u2 - devscripts 2.15.3+deb8u1 - exim4 4.84.2-2+deb8u1 - libintl-perl 1.23-1+deb8u1 - libmime-charset-perl 1.011.1-1+deb8u2 - libmime-encwords-perl 1.014.3-1+deb8u1 - libmodule-build-perl 0.421000-2+deb8u1 - libnet-dns-perl 0.81-2+deb8u1 - libsys-syslog-perl 0.33-1+deb8u1 - libunicode-linebreak-perl 0.0.20140601-2+deb8u2 We recommend that you upgrade your perl packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJXlhzPAAoJEAVMuPMTQ89EwsUP/1BZjRFPTuneFJoIMDfHbskQ 5IqGErHNDKBpueuHy53lndjyXyvauNVXkITLsQ4VXH5oCqM+iidQEY6eKLwingzS 33QgkLmZZB2GZHcXLFBekqRfJ54+Uzon8236iYx5HAy6/EvB5ITVct1elirqihwW E37BmHS0Ldvp9NWqiv5wivFEIIy/bVpn2jPSnNnaT+lbuZZATo2YECTeqY3vDeuz 8hrHdgfnky2vMNTZa9WIoaspRCJ0NZ5cb2/Lvod8/yQdy1rwRCXuGdeH01Wb9iED OTSTzkqViKu3jCBNFwwwcbPE+cCC7gUqbVYljCsqXZSRiTalTPKGNC80ewoDXdEK /9X7jbXsUzPH7+8F6bLqZZRoLLlKi1qm0hj3+jaEOKZ1/PlH9XtAuXgvU5RDfw1s sq0MGpz/hUidbyE+ZozTQkBHeXiGG+F16+HVyHDSeyhalcVVtsY8lXdcQBBa+7pB 3/cWsge1fKdmXdKTyGoMMq1pOtBdSusvABSt7wiTtJENe87PBY7VlekFfaGZdpwd wOyijWefnUjY6pYIS+0tPOqWnSWAcpKYEWgX5dwdwJmk8UDv3WdpAYvvZWTDRkM7 Pt241qhsM6qGpmcvZ0PPsa52fbe29NciIN4/jNh18maGg4vEcfJEkGYaC+E/CB5c JLj3TukJdu+FBk4QLadX =L1Uu -----END PGP SIGNATURE-----
