Vulnerability · Published Jun 10, 2021 · Assigned by apache
CVE-2020-35452mod_auth_digest possible stack overflow by one nul byte
High 7.3
In plain English
A high-severity security flaw in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 53.2% (higher than 99% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.3High
Exploit odds (30 days)53.2%top 1.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Digest nonce can cause a stack overflow in mod_auth_digest. There is no report of this overflow being exploitable, nor the Apache HTTP Server team could create one, though some particular compiler and/or compilation option might make it possible, with limited consequences anyway due to the size (a single byte) and the value (zero byte) of the overflow
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | httpd | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | httpd | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-devel | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-devel | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-filesystem | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-manual | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-manual | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-tools | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | httpd-tools | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | mod_http2 | 1.15.7-5.module_el8.6.0+2872+fe0ff7aa | ALSA-2022:1915 |
| AlmaLinux:8 | mod_ldap | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | mod_ldap | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | mod_md | 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa | ALSA-2022:1915 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | mod_proxy_html | 1:2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | mod_session | 2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| AlmaLinux:8 | mod_session | 2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-47.module_el8.6.0+2935+fb177b09.2 | ALSA-2022:1915 |
| AlmaLinux:8 | mod_ssl | 1:2.4.37-47.module_el8.6.0+2872+fe0ff7aa.1.alma | ALSA-2022:1915 |
| Alpine:v3.20 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-35452 |
| Alpine:v3.21 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-35452 |
| Alpine:v3.22 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-35452 |
| Alpine:v3.23 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-35452 |
| Alpine:v3.24 | apache2 | 2.4.48-r0 | ALPINE-CVE-2020-35452 |
| Debian:12 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-35452 |
| Debian:13 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-35452 |
| Debian:14 | apache2 | 2.4.46-6 | DEBIAN-CVE-2020-35452 |
| Rocky Linux:8 | httpd | 0:2.4.37-47.module+el8.6.0+823+f143cee1.1 | RLSA-2022:1915 |
| Rocky Linux:8 | mod_http2 | 0:1.15.7-5.module+el8.6.0+823+f143cee1 | RLSA-2022:1915 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.4.0+553+7a69454b | RLSA-2022:1915 |
| Rocky Linux:8 | mod_md | 1:2.0.8-8.module+el8.5.0+695+1fa8055e | RLSA-2022:1915 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache HTTP Server | 2.4.462.4.432.4.412.4.392.4.382.4.372.4.352.4.34 |
References
- http://httpd.apache.org/security/vulnerabilities_24.html x_refsource_MISC
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8d0bf3%40%3Ccvs.httpd.apache.org%3E x_refsource_MISC
- [httpd-announce] 20210609 CVE-2020-35452: mod_auth_digest possible stack overflow by one nul byte mailing-list, x_refsource_MLIST
- [httpd-dev] 20210610 Re: svn commit: r1890598 - in /httpd/site/trunk/content/security/json: CVE-2019-17567.json CVE-2020-13938.json CVE-2020-13950.json CVE-2020-35452.json CVE-2021-26690.json CVE-2021-26691.json CVE-2021-30641.json CVE-2021-31618.json mailing-list, x_refsource_MLIST
- [oss-security] 20210609 CVE-2020-35452: Apache httpd: mod_auth_digest possible stack overflow by one nul byte mailing-list, x_refsource_MLIST
- [debian-lts-announce] 20210709 [SECURITY] [DLA 2706-1] apache2 security update mailing-list, x_refsource_MLIST
- DSA-4937 vendor-advisory, x_refsource_DEBIAN
- GLSA-202107-38 vendor-advisory, x_refsource_GENTOO
- FEDORA-2021-dce7e7738e vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-e3f6dd670d vendor-advisory, x_refsource_FEDORA
- https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20210702-0001/ x_refsource_CONFIRM