PT-2020-13337 · Naviserver · Naviserver

Published 2020-05-16 · Updated 2021-07-21 · CVE-2020-13111

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions NaviServer versions 4.99.4 through 4.99.19

Description The issue allows for a denial of service due to the ChunkedDecode function in nsd/driver.c not properly validating the length of a chunk. A remote attacker can craft a chunked-transfer request that will result in a negative value being passed to memmove via the size parameter, causing the process to crash.

Recommendations For versions 4.99.4 through 4.99.19, as a temporary workaround, consider restricting access to the ChunkedDecode function in nsd/driver.c until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

RCE

Weakness Enumeration

CWE-787

CWE-20

Related Identifiers

CVE-2020-13111

Affected Products

Naviserver

References · 5

• https://bitbucket.org/naviserver/naviserver/commits/a5c3079f1d8996d5f34c9384a440acf3519ca3bb · Patch
• https://osv.dev/vulnerability/CVE-2020-13111 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-13111 · Security Note
• https://sourceforge.net/p/naviserver/bugs/89 · Note
• https://t.me/cvenotify/3859 · Telegram Post