CVE-2016-4483

The xmlBufAttrSerializeTxtContent function in xmlsave.c in libxml2 allows context-dependent attackers to cause a denial of service (out-of-bounds read and application crash) via a non-UTF-8 attribute value, related to serialization. NOTE: this vulnerability may be a duplicate of CVE-2016-3627.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• http://rhn.redhat.com/errata/RHSA-2016-2957.html
• http://www.debian.org/security/2016/dsa-3593
• http://www.openwall.com/lists/oss-security/2016/05/03/8
• http://www.openwall.com/lists/oss-security/2016/05/04/7
• http://www.openwall.com/lists/oss-security/2016/06/07/4
• http://www.openwall.com/lists/oss-security/2016/06/07/5
• http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
• http://www.securityfocus.com/bid/90013
• http://www.securitytracker.com/id/1036348
• https://git.gnome.org/browse/libxml2/commit/?id=c97750d11bb8b6f3303e7131fe526a61ac65bcfd
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://security.gentoo.org/glsa/201701-37
• https://www.tenable.com/security/tns-2016-18
• http://rhn.redhat.com/errata/RHSA-2016-2957.html
• http://www.debian.org/security/2016/dsa-3593
• http://www.openwall.com/lists/oss-security/2016/05/03/8
• http://www.openwall.com/lists/oss-security/2016/05/04/7
• http://www.openwall.com/lists/oss-security/2016/06/07/4
• http://www.openwall.com/lists/oss-security/2016/06/07/5
• http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
• http://www.securityfocus.com/bid/90013
• http://www.securitytracker.com/id/1036348
• https://git.gnome.org/browse/libxml2/commit/?id=c97750d11bb8b6f3303e7131fe526a61ac65bcfd
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://security.gentoo.org/glsa/201701-37
• https://www.tenable.com/security/tns-2016-18