CVE-2020-1927
published 2020-04-02CVE-2020-1927: In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and…
PriorityP345medium6.1CVSS 3.1
AVNACLPRNUIRSCCLILAN
EPSS
56.69%
99.1th percentile
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
Affected
24 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | apache_http_server | — | — |
| apache | http_server | 2.4.0 – 2.4.41 | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| canonical | ubuntu_linux | — | — |
| debian | apache2 | < apache2 2.4.43-1 (bookworm) | apache2 2.4.43-1 (bookworm) |
| debian | debian_linux | — | — |
| debian | debian_linux | — | — |
| fedoraproject | fedora | — | — |
| fedoraproject | fedora | — | — |
| opensuse | leap | — | — |
| oracle | communications_element_manager | — | — |
| oracle | communications_element_manager | — | — |
| oracle | communications_element_manager | — | — |
| oracle | communications_session_report_manager | — | — |
| oracle | communications_session_report_manager | — | — |
| oracle | communications_session_report_manager | — | — |
| oracle | communications_session_route_manager | — | — |
| oracle | communications_session_route_manager | — | — |
| oracle | communications_session_route_manager | — | — |
| oracle | enterprise_manager_ops_center | — | — |
| oracle | instantis_enterprisetrack | 17.1 – 17.3 | — |
| oracle | sd-wan_aware | — | — |
| oracle | zfs_storage_appliance_kit | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →Look for encoded newlines (e.g., %0a, %0d) in HTTP request URLs targeting mod_rewrite redirect rules, which may indicate an open redirect exploitation attempt against CVE-2020-1927. ↗
- →Focus detection on Apache HTTP Server versions 2.4.0 through 2.4.41 running mod_rewrite with self-referential redirect rules as the vulnerable attack surface. ↗
- →The attack vector is remote and delivered over HTTP; monitor for anomalous redirect responses (3xx) from Apache servers where the Location header points to an unexpected external URL. ↗
- ·Only mod_rewrite configurations using self-referential redirects are vulnerable; not all mod_rewrite rules are affected. ↗
- ·Red Hat Enterprise Linux 5 and 6 ship with httpd versions outside the vulnerable range (2.4.0–2.4.41) and are not affected. ↗
CVSS provenance
nvdv3.16.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
nvdv2.05.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:N
osv9.8CRITICAL
vendor_ubuntu9.8CRITICAL
vendor_debian6.1LOW
vendor_oracle6.1MEDIUM
vendor_redhat6.1MEDIUM
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Oracle
Oracle Oracle Fusion Middleware Risk Matrix: SSL Module (Apache HTTP Server) — CVE-2020-1927
vendor_oracle·2022-07-15·CVSS 6.1
CVE-2020-1927 [MEDIUM] Oracle Oracle Fusion Middleware Risk Matrix: SSL Module (Apache HTTP Server) — CVE-2020-1927
Oracle Oracle Fusion Middleware Risk Matrix: SSL Module (Apache HTTP Server) vulnerability
CVE: CVE-2020-1927
CVSS: 6.1
Protocol: HTTP
Remote exploit: Yes
Affected versions: Network
Advisory: cpujul2022 (JUL 2022)
Oracle
Oracle Oracle Communications Risk Matrix: OS (Linux Kernel) — CVE-2020-1927
vendor_oracle·2021-04-15·CVSS 6.1
CVE-2020-1927 [MEDIUM] Oracle Oracle Communications Risk Matrix: OS (Linux Kernel) — CVE-2020-1927
Oracle Oracle Communications Risk Matrix: OS (Linux Kernel) vulnerability
CVE: CVE-2020-1927
CVSS: 6.1
Protocol: Multiple
Remote exploit: Yes
Affected versions: Network
Advisory: cpuapr2021 (APR 2021)
Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2020-08-13·CVSS 9.8
CVE-2020-9490 [CRITICAL] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
Fabrice Perez discovered that the Apache mod_rewrite module incorrectly
handled certain redirects. A remote attacker could possibly use this issue
to perform redirects to an unexpected URL. (CVE-2020-1927)
Chamal De Silva discovered that the Apache mod_proxy_ftp module incorrectly
handled memory when proxying to a malicious FTP server. A remote attacker
could possibly use this issue to obtain sensitive information.
(CVE-2020-1934)
Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
properly handle certain Cache-Digest headers. A remote attacker could
possibly use this issue to cause Apache to crash, resulting in a denial of
service. This issue only affected
Red Hat
httpd: mod_rewrite configurations vulnerable to open redirect
vendor_redhat·2020-04-01·CVSS 6.1
CVE-2020-1927 [MEDIUM] CWE-601 httpd: mod_rewrite configurations vulnerable to open redirect
httpd: mod_rewrite configurations vulnerable to open redirect
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
A flaw was found in Apache HTTP Server (httpd) versions 2.4.0 to 2.4.41. Redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirected instead to an unexpected URL within the request URL.
Statement: This issue only affects httpd versions between 2.4.0 and 2.4.41. Therefore Red Hat Enterprise Linux 5 and 6 are not affected by this flaw.
Package: httpd (Red Hat Enterprise Linux 5) - Not affected
Package: httpd (Red Hat Enterprise Linux 6)
Debian
CVE-2020-1927: apache2 - In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite tha...
vendor_debian·2020·CVSS 6.1
CVE-2020-1927 [MEDIUM] CVE-2020-1927: apache2 - In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite tha...
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
Scope: local
bookworm: resolved (fixed in 2.4.43-1)
bullseye: resolved (fixed in 2.4.43-1)
forky: resolved (fixed in 2.4.43-1)
sid: resolved (fixed in 2.4.43-1)
trixie: resolved (fixed in 2.4.43-1)
GHSA
GHSA-h8gj-rgqf-fpq3: In Apache HTTP Server 2
ghsa_unreviewed·2022-05-24
CVE-2020-1927 [MEDIUM] CWE-601 GHSA-h8gj-rgqf-fpq3: In Apache HTTP Server 2
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
OSV
apache2 vulnerabilities
osv·2020-08-13·CVSS 9.8
CVE-2020-1927 [CRITICAL] apache2 vulnerabilities
apache2 vulnerabilities
Fabrice Perez discovered that the Apache mod_rewrite module incorrectly
handled certain redirects. A remote attacker could possibly use this issue
to perform redirects to an unexpected URL. (CVE-2020-1927)
Chamal De Silva discovered that the Apache mod_proxy_ftp module incorrectly
handled memory when proxying to a malicious FTP server. A remote attacker
could possibly use this issue to obtain sensitive information.
(CVE-2020-1934)
Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not
properly handle certain Cache-Digest headers. A remote attacker could
possibly use this issue to cause Apache to crash, resulting in a denial of
service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2020-9490)
Felix Wilhelm discovered that
OSV
CVE-2020-1927: In Apache HTTP Server 2
osv·2020-04-02·CVSS 6.1
CVE-2020-1927 [MEDIUM] CVE-2020-1927: In Apache HTTP Server 2
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect [fedora-all]
bugzilla·2020-04-03·CVSS 6.1
CVE-2020-1927 [MEDIUM] CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect [fedora-all]
CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multiple support
Bugzilla
CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect
bugzilla·2020-04-03·CVSS 6.1
CVE-2020-1927 [MEDIUM] CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect
CVE-2020-1927 httpd: mod_rewrite configurations vulnerable to open redirect
In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within the request URL.
References:
https://httpd.apache.org/security/vulnerabilities_24.html
Discussion:
Created httpd tracking bugs for this issue:
Affects: fedora-all [bug 1820775]
---
Statement:
This issue only affects httpd versions between 2.4.0 and 2.4.41. Therefore Red Hat Enterprise Linux 5 and 6 are not affected by this flaw.
---
External References:
https://httpd.apache.org/security/vulnerabilities_24.html
---
This issue has been addressed in the following products:
JBoss Core Services Apache H
CTF
Jacob the Boss / Readme
ctf_writeups·CVSS 9.8
CVE-2023-38408 [CRITICAL] Jacob the Boss / Readme
# [Jacob the Boss - TryHackMe writeup](https://tryhackme.com/room/jacobtheboss)
Find a way in and learn a little more.
## Task 1
Well, the flaw that makes up this box is the reproduction found in the production environment of a customer a while ago, the verification in season consisted of two steps, the last one within the environment, we hit it head-on and more than 15 machines were vulnerable that together with the development team we were able to correct and adapt.
*First of all, add the jacobtheboss.box address to your hosts file.*
Anyway, learn a little more, have fun!
Answer the questions below
### user.txt
```
f4d491f280de360cc49e26ca1587cbcc
```
### root.txt
```
29a5641eaa0c01abe5749608c8232806
```
## Initial Enumeration
I started with a full port and service scan usi
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00002.htmlhttp://www.openwall.com/lists/oss-security/2020/04/03/1http://www.openwall.com/lists/oss-security/2020/04/04/1https://httpd.apache.org/security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r10b853ea87dd150b0e76fda3f8254dfdb23dd05fa55596405b58478e%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r1719675306dfbeaceff3dc63ccad3de2d5615919ca3c13276948b9ac%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r52a52fd60a258f5999a8fa5424b30d9fd795885f9ff4828d889cd201%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r6a4146bf3d1645af2880f8b7a4fd8afd696d5fd4a3ae272f49f5dc84%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r70ba652b79ba224b2cbc0a183078b3a49df783b419903e3dcf4d78c7%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r731d43caece41d78d8c6304641a02a369fd78300e7ffaf566b06bc59%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.debian.org/debian-lts-announce/2021/07/msg00006.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A2RN46PRBJE7E7OPD4YZX5SVWV5QKGV5/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYVYE2ZERFXDV6RMKK3I5SDSDQLPSEIQ/https://security.netapp.com/advisory/ntap-20200413-0002/https://usn.ubuntu.com/4458-1/https://www.debian.org/security/2020/dsa-4757https://www.oracle.com/security-alerts/cpuApr2021.htmlhttps://www.oracle.com/security-alerts/cpujul2020.htmlhttps://www.oracle.com/security-alerts/cpujul2022.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00002.htmlhttp://www.openwall.com/lists/oss-security/2020/04/03/1http://www.openwall.com/lists/oss-security/2020/04/04/1https://httpd.apache.org/security/vulnerabilities_24.htmlhttps://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r09bb998baee74a2c316446bd1a41ae7f8d7049d09d9ff991471e8775%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r10b853ea87dd150b0e76fda3f8254dfdb23dd05fa55596405b58478e%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r1719675306dfbeaceff3dc63ccad3de2d5615919ca3c13276948b9ac%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r3c5c3104813c1c5508b55564b66546933079250a46ce50eee90b2e36%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r52a52fd60a258f5999a8fa5424b30d9fd795885f9ff4828d889cd201%40%3Cdev.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r6a4146bf3d1645af2880f8b7a4fd8afd696d5fd4a3ae272f49f5dc84%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r70ba652b79ba224b2cbc0a183078b3a49df783b419903e3dcf4d78c7%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r731d43caece41d78d8c6304641a02a369fd78300e7ffaf566b06bc59%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rdf3e5d0a5f5c3d90d6013bccc6c4d5af59cf1f8c8dea5d9a283d13ce%40%3Ccvs.httpd.apache.org%3Ehttps://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3Ehttps://lists.debian.org/debian-lts-announce/2021/07/msg00006.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A2RN46PRBJE7E7OPD4YZX5SVWV5QKGV5/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HYVYE2ZERFXDV6RMKK3I5SDSDQLPSEIQ/https://security.netapp.com/advisory/ntap-20200413-0002/https://usn.ubuntu.com/4458-1/https://www.debian.org/security/2020/dsa-4757https://www.oracle.com/security-alerts/cpuApr2021.htmlhttps://www.oracle.com/security-alerts/cpujul2020.htmlhttps://www.oracle.com/security-alerts/cpujul2022.html
2020-04-02
Published