Multiple vulnerabilities in OpenSSL



Published: 2021-02-17
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE ID CVE-2021-23841
CVE-2021-23839
CVE-2021-23840
CWE ID CWE-476
CWE-310
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
OpenSSL
Server applications / Encryption software

Vendor OpenSSL Software Foundation

Security Advisory

1) NULL pointer dereference

Risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-23841

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.0, 1.0.0a, 1.0.0b, 1.0.0c, 1.0.0d, 1.0.0e, 1.0.0f, 1.0.0g, 1.0.0h, 1.0.0i, 1.0.0j, 1.0.0k, 1.0.0l, 1.0.0m, 1.0.0n, 1.0.0o, 1.0.0p, 1.0.0q, 1.0.0r, 1.0.0s, 1.0.0t, 1.0.1, 1.0.1a, 1.0.1b, 1.0.1c, 1.0.1d, 1.0.1e, 1.0.1e-25.el7, 1.0.1f, 1.0.1g, 1.0.1h, 1.0.1i, 1.0.1j, 1.0.1k, 1.0.1l, 1.0.1m, 1.0.1n, 1.0.1o, 1.0.1p, 1.0.1q, 1.0.1r, 1.0.1s, 1.0.1t, 1.0.1u, 1.0.2, 1.0.2a, 1.0.2b, 1.0.2c, 1.0.2d, 1.0.2e, 1.0.2f, 1.0.2g, 1.0.2h, 1.0.2i, 1.0.2j, 1.0.2k, 1.0.2l, 1.0.2m, 1.0.2n, 1.0.2o, 1.0.2p, 1.0.2q, 1.0.2r, 1.0.2s, 1.0.2t, 1.0.2u, 1.0.2v, 1.0.2w, 1.0.2x, 1.1.0, 1.1.0a, 1.1.0b, 1.1.0c, 1.1.0d, 1.1.0e, 1.1.0f, 1.1.0g, 1.1.0h, 1.1.0i, 1.1.0j, 1.1.0k, 1.1.0l, 1.1.1, 1.1.1a, 1.1.1b, 1.1.1c, 1.1.1d, 1.1.1e, 1.1.1f, 1.1.1g, 1.1.1h, 1.1.1i

CPE External links

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
https://www.openssl.org/news/secadv/20210216.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Cryptographic issues

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-23839

CWE-ID: CWE-310 - Cryptographic Issues

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a MitM attack.

The vulnerability exists due to a faulty implementation of the padding check when server is configured to support SSLv2 protocol. A remote attacker can perform a MitM attack and force the server to use less secure protocols.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.2s, 1.0.2t, 1.0.2u, 1.0.2v, 1.0.2w, 1.0.2x

CPE External links

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=30919ab80a478f2d81f2e9acdcca3fa4740cd547
https://www.openssl.org/news/secadv/20210216.txt
https://www.trustwave.com/en-us/resources/security-resources/security-advisories/?fid=28459

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Input validation error

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2021-23840

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: No

Description

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.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.0, 1.0.0a, 1.0.0b, 1.0.0c, 1.0.0d, 1.0.0e, 1.0.0f, 1.0.0g, 1.0.0h, 1.0.0i, 1.0.0j, 1.0.0k, 1.0.0l, 1.0.0m, 1.0.0n, 1.0.0o, 1.0.0p, 1.0.0q, 1.0.0r, 1.0.0s, 1.0.0t, 1.0.1, 1.0.1a, 1.0.1b, 1.0.1c, 1.0.1d, 1.0.1e, 1.0.1e-25.el7, 1.0.1f, 1.0.1g, 1.0.1h, 1.0.1i, 1.0.1j, 1.0.1k, 1.0.1l, 1.0.1m, 1.0.1n, 1.0.1o, 1.0.1p, 1.0.1q, 1.0.1r, 1.0.1s, 1.0.1t, 1.0.1u, 1.0.2, 1.0.2a, 1.0.2b, 1.0.2c, 1.0.2d, 1.0.2e, 1.0.2f, 1.0.2g, 1.0.2h, 1.0.2i, 1.0.2j, 1.0.2k, 1.0.2l, 1.0.2m, 1.0.2n, 1.0.2o, 1.0.2p, 1.0.2q, 1.0.2r, 1.0.2s, 1.0.2t, 1.0.2u, 1.0.2v, 1.0.2w, 1.0.2x, 1.1.0, 1.1.0a, 1.1.0b, 1.1.0c, 1.1.0d, 1.1.0e, 1.1.0f, 1.1.0g, 1.1.0h, 1.1.0i, 1.1.0j, 1.1.0k, 1.1.0l, 1.1.1, 1.1.1a, 1.1.1b, 1.1.1c, 1.1.1d, 1.1.1e, 1.1.1f, 1.1.1g, 1.1.1h, 1.1.1i

CPE External links

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=6a51b9e1d0cf0bf8515f7201b68fb0a3482b3dc1
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=9b1129239f3ebb1d1c98ce9ed41d5c9476c47cb2
https://www.openssl.org/news/secadv/20210216.txt

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



###SIDEBAR###