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[security][HIGH] avahi 0.8: CVE-2021-26720 require triage #1

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opened 2026-05-25 20:44:38 +03:00 by sbelikov · 1 comment

sbelikov commented

2026-05-25 20:44:38 +03:00

Owner

CVE triage request / Запрос на разбор CVE

Package / Пакет

Package: avahi
Version: 0.8
EVR: 0.8-1
Category: -
Policy class: -
NiceOS policy class: -
Owner: -
Severity: HIGH
Max CVSS: 7.8
CVE count: 1
Included NiceOS statuses: needs_triage
Included match types: cpe-range

LLM recommendation / Рекомендация LLM

RU

Для пакета avahi 0.8 найдены CVE-кандидаты по данным NVD/CPE: CVE-2021-26720. Требуется triage security-team.

Проверить применимость CVE к сборке НАЙС.ОС, сопоставить с upstream/vendor advisory, определить статус affected/fixed/not_affected и при необходимости подготовить обновление пакета.

Рекомендуемое действие: needs_triage

Подсказка по целевой версии: -

Проверки: Проверить сборку RPM, обновление пакета, совместимость зависимостей, service/CLI smoke tests и регрессионные сценарии по классу пакета.

Риски: Автоматическое совпадение NVD/CPE не является финальным вердиктом по НАЙС.ОС.

EN

NVD/CPE candidate CVEs were found for avahi 0.8: CVE-2021-26720. Security-team triage is required.

Verify CVE applicability to the NiceOS build, compare with upstream/vendor advisories, set affected/fixed/not_affected status, and prepare a package update if required.

Recommended action: needs_triage

Target version hint: -

Tests: Run RPM build, package upgrade, dependency compatibility, service/CLI smoke tests, and package-class-specific regression tests.

Risks: An automatic NVD/CPE match is not the final NiceOS vulnerability verdict.

CVE candidates from NVD/CPE

CVE	Severity	CVSS	Match	Confidence	NiceOS status	Fixed in	Existing issue	Reason
CVE-2021-26720	HIGH	7.8	cpe-range	85	needs_triage			package version is inside version range

Descriptions

CVE-2021-26720

avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.

Scanner integration / Интеграция со сканером

This issue was generated from niceos_cve_matches after the SPEC/Forgejo evidence pass.
After real creation, this script writes forgejo_issue_open rows into niceos_cve_evidence and marks the selected CVE rows as issue_open, so the next scanner/creator run does not duplicate the issue.

Maintainer checklist

Verify whether each CVE applies to the NiceOS build.
Compare NVD data with upstream/vendor advisory.
Set final NiceOS status: affected, fixed, not_affected, false_positive, deferred, or not_in_cloud_image.
If affected, decide update/backport strategy according to package policy class.
Run package-class-specific build, upgrade and regression tests.
Add/update niceos_cve_triage entry.
Create NICE-SA advisory if a security update is shipped.

Machine metadata

{
  "cves": [
    "CVE-2021-26720"
  ],
  "fingerprint": "1d2a0755fd055060d2a4",
  "generated_at": "2026-05-25T17:44:37Z",
  "match_ids": [
    1084
  ],
  "match_types": [
    "cpe-range"
  ],
  "package": "avahi",
  "prompt_version": "niceos_cve_issue_analysis_v2",
  "statuses": [
    "needs_triage"
  ],
  "tool": "niceos_cve_create_issues.py",
  "tool_version": "2.0",
  "version": "0.8"
}

# CVE triage request / Запрос на разбор CVE ## Package / Пакет - Package: `avahi` - Version: `0.8` - EVR: `0.8-1` - Category: `-` - Policy class: `-` - NiceOS policy class: `-` - Owner: `-` - Severity: `HIGH` - Max CVSS: `7.8` - CVE count: `1` - Included NiceOS statuses: `needs_triage` - Included match types: `cpe-range` ## LLM recommendation / Рекомендация LLM ### RU Для пакета avahi 0.8 найдены CVE-кандидаты по данным NVD/CPE: CVE-2021-26720. Требуется triage security-team. Проверить применимость CVE к сборке НАЙС.ОС, сопоставить с upstream/vendor advisory, определить статус affected/fixed/not_affected и при необходимости подготовить обновление пакета. **Рекомендуемое действие:** `needs_triage` **Подсказка по целевой версии:** `-` **Проверки:** Проверить сборку RPM, обновление пакета, совместимость зависимостей, service/CLI smoke tests и регрессионные сценарии по классу пакета. **Риски:** Автоматическое совпадение NVD/CPE не является финальным вердиктом по НАЙС.ОС. ### EN NVD/CPE candidate CVEs were found for avahi 0.8: CVE-2021-26720. Security-team triage is required. Verify CVE applicability to the NiceOS build, compare with upstream/vendor advisories, set affected/fixed/not_affected status, and prepare a package update if required. **Recommended action:** `needs_triage` **Target version hint:** `-` **Tests:** Run RPM build, package upgrade, dependency compatibility, service/CLI smoke tests, and package-class-specific regression tests. **Risks:** An automatic NVD/CPE match is not the final NiceOS vulnerability verdict. ## CVE candidates from NVD/CPE | CVE | Severity | CVSS | Match | Confidence | NiceOS status | Fixed in | Existing issue | Reason | |---|---|---:|---|---:|---|---|---|---| | CVE-2021-26720 | HIGH | 7.8 | cpe-range | 85 | needs_triage | | | package version is inside version range | ## Descriptions ### CVE-2021-26720 avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product. ## Scanner integration / Интеграция со сканером This issue was generated from `niceos_cve_matches` after the SPEC/Forgejo evidence pass. After real creation, this script writes `forgejo_issue_open` rows into `niceos_cve_evidence` and marks the selected CVE rows as `issue_open`, so the next scanner/creator run does not duplicate the issue. ## Maintainer checklist - [ ] Verify whether each CVE applies to the NiceOS build. - [ ] Compare NVD data with upstream/vendor advisory. - [ ] Set final NiceOS status: `affected`, `fixed`, `not_affected`, `false_positive`, `deferred`, or `not_in_cloud_image`. - [ ] If affected, decide update/backport strategy according to package policy class. - [ ] Run package-class-specific build, upgrade and regression tests. - [ ] Add/update `niceos_cve_triage` entry. - [ ] Create `NICE-SA` advisory if a security update is shipped. ## Machine metadata ```json { "cves": [ "CVE-2021-26720" ], "fingerprint": "1d2a0755fd055060d2a4", "generated_at": "2026-05-25T17:44:37Z", "match_ids": [ 1084 ], "match_types": [ "cpe-range" ], "package": "avahi", "prompt_version": "niceos_cve_issue_analysis_v2", "statuses": [ "needs_triage" ], "tool": "niceos_cve_create_issues.py", "tool_version": "2.0", "version": "0.8" } ```

sbelikov added the

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2026-05-25 20:44:38 +03:00

sbelikov commented

2026-05-26 12:02:11 +03:00

Author

Owner

CVE resolution / Закрытие CVE

EN

Resolved in NiceOS branch niceos-5.2.
Status: not_affected.
Fixed in EVR: 0.8-1.
CVE: CVE-2021-26720.
Source: SPECS/avahi.spec.

RU

Исправлено в ветке НАЙС.ОС niceos-5.2.
Статус: not_affected.
Исправлено в EVR: 0.8-1.
CVE: CVE-2021-26720.
Источник: SPECS/avahi.spec.

## CVE resolution / Закрытие CVE ### EN Resolved in NiceOS branch `niceos-5.2`. Status: `not_affected`. Fixed in EVR: `0.8-1`. CVE: `CVE-2021-26720`. Source: `SPECS/avahi.spec`. ### RU Исправлено в ветке НАЙС.ОС `niceos-5.2`. Статус: `not_affected`. Исправлено в EVR: `0.8-1`. CVE: `CVE-2021-26720`. Источник: `SPECS/avahi.spec`.

sbelikov closed this issue

2026-05-26 12:02:11 +03:00