CVE-2019-20454
HIGH severity · CVSS 7.5 · Out-of-bounds read
7.5CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)2%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=1735494 ↗
Additional information
- NVD record
- https://bugzilla.redhat.com/show_bug.cgi?id=1735494Patch
- https://vcs.pcre.org/pcre2?view=revision&revision=1092Patch
- https://bugs.exim.org/show_bug.cgi?id=2421Advisory
- https://lists.debian.org/debian-lts-announce/2023/03/msg00014.htmlAdvisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/Advisory
- https://security.gentoo.org/glsa/202006-16Advisory
- https://bugs.php.net/bug.php?id=78338Advisory