Main Vulnerability Database Vulnerabilities #VU50921

NULL pointer dereference in libxls - CVE-2020-27819

Published: February 24, 2021

Vulnerability identifier: #VU50921

CSH Severity: Medium

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-27819

CWE-ID: CWE-476

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to a NULL pointer dereference error within the libxls/xls2csv.c file in libxls when parsing XLS cells. A remote attacker can trigger denial of service conditions via crafted XLS file.

Affected software

libxls
Fedora
libxls

How to mitigate CVE-2020-27819

Install update from vendor's website.

libxls - update to 1.6.2
libxls - addressed in versions 1.5.3-3.fc32, 1.6.1-2.fc33

External References

https://bugzilla.redhat.com/show_bug.cgi?id=1903296
https://github.com/libxls/libxls/issues/84

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