libxslt through 1.1.33 allows bypass of a protection mechanism because callers of xsltCheckRead and xsltCheckWrite permit access even upon receiving a -1 error code. xsltCheckRead can return -1 for a crafted URL that is not actually invalid and is subsequently loaded.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00048.html
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00052.html
• http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00053.html
• http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00025.html
• http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00001.html
• http://www.openwall.com/lists/oss-security/2019/04/22/1
• http://www.openwall.com/lists/oss-security/2019/04/23/5
• https://gitlab.gnome.org/GNOME/libxslt/commit/e03553605b45c88f0b4b2980adfbbb8f6fca2fd6
• https://lists.debian.org/debian-lts-announce/2019/04/msg00016.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36TEYN37XCCKN2XUMRTBBW67BPNMSW4K/

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