CVE-2021-34715 Vulnerability Analysis & Exploit Details

CVE-2021-34715
Vulnerability Scoring

4.7
/10
Medium Risk

The vulnerability CVE-2021-34715 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: High
    High-level privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2021-34715 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:11 UTC
Originally published on: 🕗 18 Aug 2021, 20:15 UTC

Time between publication and last update: 1190 days

CVSS Release: version 3

CVSS3 Source

ykramarz@cisco.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L

CVE-2021-34715 Vulnerability Summary

CVE-2021-34715: A vulnerability in the image verification function of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker to execute code with internal user privileges on the underlying operating system. The vulnerability is due to insufficient validation of the content of upgrade packages. An attacker could exploit this vulnerability by uploading a malicious archive to the Upgrade page of the administrative web interface. A successful exploit could allow the attacker to execute code with user-level privileges (the _nobody account) on the underlying operating system.

Assessing the Risk of CVE-2021-34715

Access Complexity Graph

The exploitability of CVE-2021-34715 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-34715

The exploitability of CVE-2021-34715 is influenced by multiple factors. Security teams should analyze system configurations and apply appropriate countermeasures to mitigate threats.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-34715, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-34715, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2021-34715 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2021-34715 may cause minor changes to data without severely impacting its accuracy.
  • Availability: Low
    CVE-2021-34715 may slightly degrade system performance without fully affecting service availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.234% (probability of exploit)

EPSS Percentile: 61.88% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 38.12% of others.

CVE-2021-34715 References

External References

CWE Common Weakness Enumeration

CWE-347

CAPEC Common Attack Pattern Enumeration and Classification

  • Padding Oracle Crypto Attack CAPEC-463 An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.
  • Signature Spoofing by Improper Validation CAPEC-475 An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

Vulnerable Configurations

  • cpe:2.3:a:cisco:expressway:-:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:-:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:14.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:14.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:14.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:15.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.5:rc4:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.5:rc4:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:expressway:x8.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:expressway:x8.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:-:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:-:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:-:*:*:*:control:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:-:*:*:*:control:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x.7.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x.7.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:14.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:14.0.5:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:14.0.5:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:14.0.7:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:14.0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x5.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x6.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x6.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.2:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1.2:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.2:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.2:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:-:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:-:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.2:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.2:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.3:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5.3:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:rc4:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:rc4:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.1:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.1:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.2:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.2:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.3:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7.3:*:*:*:expressway:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.8:*:*:*:*:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.8:*:*:*:*:*:*:*
  • cpe:2.3:a:cisco:telepresence_video_communication_server:x8.8:*:*:*:expressway:*:*:*
    cpe:2.3:a:cisco:telepresence_video_communication_server:x8.8:*:*:*:expressway:*:*:*

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