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CVE-2019-20454

Published: 14 February 2020

An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.

Priority

Low

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
pcre2
Launchpad, Ubuntu, Debian
bionic Needed

eoan Ignored
(end of life)
focal Not vulnerable
(10.34-7)
trusty Does not exist

upstream
Released (10.34-1)
xenial Not vulnerable
(code not present)
groovy Not vulnerable
(10.34-7)
hirsute Not vulnerable
(10.34-7)
impish Not vulnerable
(10.34-7)
jammy Not vulnerable
(10.34-7)
kinetic Not vulnerable
(10.34-7)
lunar Not vulnerable
(10.34-7)
mantic Not vulnerable
(10.34-7)
Patches:
upstream: https://vcs.pcre.org/pcre2?view=revision&revision=1092
upstream: https://vcs.pcre.org/pcre2?view=revision&revision=1091

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H