SB2021111102 - Multiple vulnerabilities in Red Hat JBoss Core Services Apache HTTP Server
Published: November 11, 2021 Updated: June 3, 2022
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 11 secuirty vulnerabilities.
1) Integer overflow (CVE-ID: CVE-2020-14155)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to integer overflow. A remote attacker can pass a large number after a (?C substring, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Input validation error (CVE-ID: CVE-2021-23840)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of user-supplied input during EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate calls. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.
3) Out-of-bounds read (CVE-ID: CVE-2019-20838)
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
libpcre in PCRE before 8.43 allows a subject buffer over-read in JIT when UTF is disabled, and X or R has more than one fixed quantifier, a related issue to CVE-2019-20454.
4) NULL pointer dereference (CVE-ID: CVE-2021-26691)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in mod_session. A a malicious backend server or SessionHeader can trigger a denial of service (DoS) condition.
5) NULL pointer dereference (CVE-ID: CVE-2020-13950)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in mod_proxy_http. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
6) Input validation error (CVE-ID: CVE-2021-30641)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to incorrect parsing of Apache configuration files. An unexpected
7) Stack-based buffer overflow (CVE-ID: CVE-2020-35452)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing Digest nounces in mod_auth_digest. A remote unauthenticated attacker can send a specially crafted HTTP request, trigger stack overflow by one nul byte and crash the server.
8) NULL pointer dereference (CVE-ID: CVE-2021-23841)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the X509_issuer_and_serial_hash() function when parsing the issuer field in the X509 certificate. A remote attacker can supply a specially crafted certificate, trigger a NULL pointer dereference error and perform a denial of service (DoS) attack.
9) Out-of-bounds read (CVE-ID: CVE-2021-3712)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition when processing ASN.1 strings related to a confusion with NULL termination of strings in array. A remote attacker can pass specially crafted data to the application to trigger an out-of-bounds read error and read contents of memory on the system or perform a denial of service (DoS) attack.
10) Security restrictions bypass (CVE-ID: CVE-2019-17567)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to unspecified error within the mod_proxy_wstunnel and mod_proxy_http modules. If mod_proxy_wstunnel is configured on an URL that is not necessarily Upgraded by the origin server and is tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.
11) NULL pointer dereference (CVE-ID: CVE-2021-26690)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in mod_session. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.