Buffer Over-read Vulnerability in PatternMatch Function in libXfont

CVE-2017-13720 · LOW Severity

AV:L/AC:L/AU:N/C:P/I:N/A:P

In the PatternMatch function in fontfile/fontdir.c in libXfont through 1.5.2 and 2.x before 2.0.2, an attacker with access to an X connection can cause a buffer over-read during pattern matching of fonts, leading to information disclosure or a crash (denial of service). This occurs because '\0' characters are incorrectly skipped in situations involving ? characters.

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