MGASA-2015-0430

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MGASA-2015-0430

Summary: Updated libebml packages fix security vulnerability

Details: In EbmlMaster::Read() in libebml before 1.3.3, when the parser encountered a deeply nested element with an infinite size then a following element of an upper level was not propagated correctly. Instead the element with the infinite size was added into the EBML element tree a second time resulting in memory access after freeing it and multiple attempts to free the same memory address during destruction (TALOS-CAN-0037). In EbmlUnicodeString::UpdateFromUTF8() in libebml before 1.3.3, when reading from a UTF-8 string in which the length indicated by a UTF-8 character's first byte exceeds the string's actual number of bytes the parser would access beyond the end of the string resulting in a heap information leak (TALOS-CAN-0036). The libebml package has been updated to version 1.3.3, which fixes these issues and other bugs, including another invalid memory access issue. The libmatroska package has also been rebuilt against the updated libebml and updated to version 1.4.4, which also fixes an invalid memory access issue and other bugs. See the release announcements for details.

References: https://advisories.mageia.org/MGASA-2015-0430.html, https://bugs.mageia.org/show_bug.cgi?id=17004, http://talosintel.com/vulnerability-reports/, http://lists.matroska.org/pipermail/matroska-users/2015-October/006981.html, http://lists.matroska.org/pipermail/matroska-users/2015-October/006985.html