Vulnerability CVE-2019-13117
Published: 2019-06-30   Modified: 2019-07-01

Description:
In numbers.c in libxslt 1.1.33, an xsl:number with certain format strings could lead to a uninitialized read in xsltNumberFormatInsertNumbers. This could allow an attacker to discern whether a byte on the stack contains the characters A, a, I, i, or 0, or any other character.

Type:

CWE-20

 (Improper Input Validation)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Xmlsoft -> Libxslt 

 References:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14471
https://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
https://lists.debian.org/debian-lts-announce/2019/07/msg00020.html
https://oss-fuzz.com/testcase-detail/5631739747106816
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