Vulnerability CVE-2021-36978

Vulnerability Name:

CVE-2021-36978 (CCN-205950)

Assigned:

2020-12-03

Published:

2020-12-03

Updated:

2021-07-29

Summary:

QPDF 9.x through 9.1.1 and 10.x through 10.0.4 has a heap-based buffer overflow in Pl_ASCII85Decoder::write (called from Pl_AES_PDF::flush and Pl_AES_PDF::finish) when a certain downstream write fails.

CVSS v3 Severity:

5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

5.5 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
4.8 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Local Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): Required
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

CVSS v2 Severity:

4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Medium Authentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

4.6 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Local Access Complexity (AC): Low Athentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

Vulnerability Type:

CWE-787

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2021-36978

Source: CCN
Type: Google Security Research Issue 28262
qpdf:qpdf_fuzzer: Heap-buffer-overflow in Pl_ASCII85Decoder::write

Source: MISC
Type: Patch, Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28262

Source: XF
Type: UNKNOWN
qpdf-cve202136978-dos(205950)

Source: MISC
Type: Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/qpdf/OSV-2020-2245.yaml

Source: CCN
Type: qpdf GIT Repository
Fix some pipelines to be safe if downstream write fails

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/qpdf/qpdf/commit/dc92574c10f3e2516ec6445b88c5d584f40df4e5

Vulnerable Configuration:

Configuration 1:

cpe:/a:qpdf_project:qpdf:*:*:*:*:*:*:*:* (Version >= 9.0.0 and <= 9.1.1)

OR cpe:/a:qpdf_project:qpdf:*:*:*:*:*:*:*:* (Version >= 10.0.0 and <= 10.0.4)

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:7656	P	libqpdf26-9.0.2-150200.3.3.1 on GA media (Moderate)	2023-06-12
oval:org.opensuse.security:def:752	P	Security update for qpdf (Important)	2022-09-12
oval:org.opensuse.security:def:5319	P	Security update for qpdf (Important)	2022-08-04
oval:org.opensuse.security:def:127336	P	Security update for qpdf (Important)	2022-08-04
oval:org.opensuse.security:def:6131	P	Security update for qpdf (Important)	2022-08-04
oval:org.opensuse.security:def:675	P	Security update for qpdf (Important)	2022-08-04
oval:org.opensuse.security:def:125775	P	Security update for qpdf (Important)	2022-08-04
oval:org.opensuse.security:def:126938	P	Security update for qpdf (Important)	2022-08-04

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