CVE-2023-36811 Vulnerability Analysis & Exploit Details

CVE-2023-36811
Vulnerability Scoring

4.7
/10
Medium Risk

The vulnerability CVE-2023-36811 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2023-36811 Details

Status: Modified

Last updated: 🕗 21 Nov 2024, 08:10 UTC
Originally published on: 🕕 30 Aug 2023, 18:15 UTC

Time between publication and last update: 448 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2023-36811 Vulnerability Summary

CVE-2023-36811: borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup data loss in the repository. The attack requires an attacker to be able to: 1. insert files (with no additional headers) into backups and 2. gain write access to the repository. This vulnerability does not disclose plaintext to the attacker, nor does it affect the authenticity of existing archives. Creating plausible fake archives may be feasible for empty or small archives, but is unlikely for large archives. The issue has been fixed in borgbackup 1.2.5. Users are advised to upgrade. Additionally to installing the fixed code, users must follow the upgrade procedure as documented in the change log. Data loss after being attacked can be avoided by reviewing the archives (timestamp and contents valid and as expected) after any "borg check --repair" and before "borg prune". There are no known workarounds for this vulnerability.

Assessing the Risk of CVE-2023-36811

Access Complexity Graph

The exploitability of CVE-2023-36811 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-2023-36811

This vulnerability, CVE-2023-36811, requires a high level of attack complexity and low privileges, making it difficult but not impossible to exploit. Organizations should ensure robust security configurations to mitigate risks.

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-2023-36811, 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-2023-36811, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2023-36811 has no significant impact on data confidentiality.
  • Integrity: High
    CVE-2023-36811 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: None
    CVE-2023-36811 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.049% (probability of exploit)

EPSS Percentile: 21.33% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 78.67% of others.

CVE-2023-36811 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:borgbackup:borg:0.6:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.7:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.7:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.8:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.8:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.9:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.9:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.10:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.10:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.11:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.11:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.12:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.12:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.13:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.13:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.14:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.14:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.15:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.15:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.16:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.16:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.23.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.23.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.24.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.24.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.25.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.25.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.26.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.26.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.26.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.26.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.27.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.27.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.28.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.28.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.28.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.28.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.28.2:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.28.2:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.29.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.29.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.30.0:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.30.0:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:0.30.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:0.30.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.0:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.0:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.6:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.6:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.6:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.6:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.7:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.7:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.7:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.7:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.7:rc2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.7:rc2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.8:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.8:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.8:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.8:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.9:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.9:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.9:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.9:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.10:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.10:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.10:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.10:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.11:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.11:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.11:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.11:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.12:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.12:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.0.13:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.0.13:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta3:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta3:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta4:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta4:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta5:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta5:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.0:beta6:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.0:beta6:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.5:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.5:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.6:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.6:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.7:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.7:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.8:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.8:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.9:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.9:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.10:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.10:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.11:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.11:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.12:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.12:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.13:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.13:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.14:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.14:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.15:-:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.15:-:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.1.15:beta1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.1.15:beta1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:beta1:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:beta1:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:beta2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:beta2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha2:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha2:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha3:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha3:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha4:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha4:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha5:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha5:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha6:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha6:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha7:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha7:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha8:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha8:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.0:alpha9:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.0:alpha9:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:borgbackup:borg:1.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:borgbackup:borg:1.2.4:*:*:*:*:*:*:*

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