SB2019062909 - Multiple vulnerabilities in FlightCrew

Description

This security bulletin contains information about 2 vulnerabilities.

1) NULL pointer dereference (CVE-ID: CVE-2019-13032)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in FlightCrew v0.9.2 within the GetRelativePathToNcx() and GetRelativePathsToXhtmlDocuments() in xc::XMLUri::isValidURI().  A remote attacker can perform a denial of service (DoS) attack.

2) Path traversal (CVE-ID: CVE-2019-13241)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in filenames when extracting data from ZIP archives. A remote attacker can trick the victim to open a specially crafted archive and overwrite arbitrary files on the system.

Remediation

Install update from vendor's website.

References

• https://github.com/Sigil-Ebook/flightcrew/issues/53
• https://salvatoresecurity.com/fun-with-fuzzers-or-how-i-discovered-three-vulnerabilities-part-1-of-3/
• https://github.com/Sigil-Ebook/flightcrew/issues/52
• https://salvatoresecurity.com/fun-with-fuzzers-how-i-discovered-three-vulnerabilities-part-3-of-3/