CVE-2019-12521

Katalog CVE

CVSS 5.9 · Medium EPSS 5,9%

Kerentanan Off-by-one Error pada squid-cache squid, canonical ubuntu linux +2 lainnya. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.

Rincian

Terbit di NVD

15 April 2020

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.9 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-193: Off-by-one Error
CWE-787: Out-of-bounds Write

EPSS (30 hari)

5,9% peluang dieksploitasi; lebih tinggi dari 93,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• http://www.openwall.com/lists/oss-security/2020/04/23/1 mailing list · patch · advisory pihak ketiga
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html mailing list · advisory pihak ketiga
• https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html mailing list · advisory pihak ketiga
• https://security.gentoo.org/glsa/202005-05 advisory pihak ketiga
• https://security.netapp.com/advisory/ntap-20210205-0006/ advisory pihak ketiga
• https://usn.ubuntu.com/4356-1/ advisory pihak ketiga
• https://www.debian.org/security/2020/dsa-4682 advisory pihak ketiga