Skip to content

Commit 2f2e35a

Browse files
advisory-database[bot]advisory-database[bot]
committed
Publish Advisories
GHSA-3m6q-h5gj-7mrw GHSA-xjvc-pw2r-6878
1 parent 901f1e4 commit 2f2e35a

2 files changed

Lines changed: 157 additions & 0 deletions

File tree

‎advisories/github-reviewed/2026/04/GHSA-3m6q-h5gj-7mrw/GHSA-3m6q-h5gj-7mrw.json‎

Lines changed: 56 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,56 @@
1+
{
2+
"schema_version": "1.4.0",
3+
"id": "GHSA-3m6q-h5gj-7mrw",
4+
"modified": "2026-04-22T20:37:21Z",
5+
"published": "2026-04-22T20:37:21Z",
6+
"aliases": [],
7+
"summary": "Gitea has insecure default SSH settings",
8+
"details": "## Summary\n\nThe built-in SSH server currently advertises a number of key exchange, MAC, and host key algorithms that are considered weak or broken. The defaults should be tightened so a fresh installation passes a baseline SSH security audit out of the box.\n\n## Details\n\nRunning `ssh-audit` against a default deployment flags the following as `fail`:\n\n- **Key exchange**\n - `ecdh-sha2-nistp256`\n - `ecdh-sha2-nistp384`\n - `ecdh-sha2-nistp521`\n- **MAC**\n - `hmac-sha1`\n- **Host key**\n - `ssh-rsa`\n\n## Reproduction\n\n```sh\ndocker run -it --rm positronsecurity/ssh-audit -p 2222 gitea.local\n```\n\n## Impact\n\nDefault deployments expose algorithms that are known-weak or deprecated upstream. The current workaround requires manually setting several `GITEA__server__SSH_SERVER_*` variables, which most users will never do.\n\n### Workaround\n\n```ini\n[server]\nSSH_SERVER_KEY_EXCHANGES = curve25519-sha256, diffie-hellman-group14-sha256\nSSH_SERVER_CIPHERS = chacha20-poly1305@openssh.com, aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com\nSSH_SERVER_MACS = hmac-sha2-256-etm@openssh.com, hmac-sha2-256\n```\n\nThere is no exposed option to restrict host key algorithms, so `ssh-rsa` remains advertised.\n\n## Acceptance criteria\n\n- [ ] Default `SSH_SERVER_KEY_EXCHANGES`, `SSH_SERVER_CIPHERS`, and `SSH_SERVER_MACS` updated to the secure list above.\n- [ ] New `SSH_SERVER_HOST_KEY_ALGORITHMS` option added, with a default that excludes `ssh-rsa`.\n- [ ] Documentation updated to reflect the new defaults.\n- [ ] `ssh-audit` against a fresh install reports no `[fail]` entries.",
9+
"severity": [
10+
{
11+
"type": "CVSS_V4",
12+
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"
13+
}
14+
],
15+
"affected": [
16+
{
17+
"package": {
18+
"ecosystem": "Go",
19+
"name": "code.gitea.io/gitea"
20+
},
21+
"ranges": [
22+
{
23+
"type": "ECOSYSTEM",
24+
"events": [
25+
{
26+
"introduced": "0"
27+
},
28+
{
29+
"fixed": "1.25.0"
30+
}
31+
]
32+
}
33+
]
34+
}
35+
],
36+
"references": [
37+
{
38+
"type": "WEB",
39+
"url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-3m6q-h5gj-7mrw"
40+
},
41+
{
42+
"type": "PACKAGE",
43+
"url": "https://github.com/go-gitea/gitea"
44+
}
45+
],
46+
"database_specific": {
47+
"cwe_ids": [
48+
"CWE-1188",
49+
"CWE-327"
50+
],
51+
"severity": "MODERATE",
52+
"github_reviewed": true,
53+
"github_reviewed_at": "2026-04-22T20:37:21Z",
54+
"nvd_published_at": null
55+
}
56+
}

‎advisories/github-reviewed/2026/04/GHSA-xjvc-pw2r-6878/GHSA-xjvc-pw2r-6878.json‎

Lines changed: 101 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,101 @@
1+
{
2+
"schema_version": "1.4.0",
3+
"id": "GHSA-xjvc-pw2r-6878",
4+
"modified": "2026-04-22T20:34:52Z",
5+
"published": "2026-04-22T20:34:52Z",
6+
"aliases": [],
7+
"summary": "Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)",
8+
"details": "## Summary\n\nFlarum's patch for [CVE-2023-27577](https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw) restricted the `@import` and `data-uri()` LESS features in the `custom_less` setting, but the same restriction was never applied to other settings registered as LESS config variables (for example `theme_primary_color` and `theme_secondary_color`, as well as any key registered via `Extend\\Settings::registerLessConfigVar()`).\n\nThose values are interpolated verbatim into the LESS source at compile time, allowing an authenticated administrator to craft a theme-color value that injects an arbitrary `@import` directive into the compiled `forum.css`. Because the underlying LESS parser honours `@import (inline) '<path>'`, an attacker can read arbitrary files reachable by the PHP process (local file inclusion) or trigger outbound HTTP(S) requests (server-side request forgery).\n\n## Impact\n\nAn attacker who has compromised — or legitimately obtained — an administrator account can:\n\n- **Read arbitrary local files** reachable by the PHP process (e.g. `/etc/passwd`, `.env`, config files containing database credentials, OAuth secrets, API keys).\n- **Trigger outbound HTTP/HTTPS requests** from the Flarum host, enabling SSRF against internal services and cloud metadata endpoints such as `http://169.254.169.254/` (AWS IMDSv1, GCP, Azure).\n\nThe contents of the attacker-controlled import are embedded into the compiled `forum.css`, which is publicly served — so the attacker can retrieve whatever was read simply by fetching the CSS file.\n\nThis is a privilege-escalation vulnerability: a forum administrator is not intended to have host-level file read or access to internal network resources.\n\n### Example payload\n\nSubmitted via `POST /api/settings` with an admin session:\n\n```json\n{ \"theme_primary_color\": \"#4D698E;@import (inline) '/etc/passwd';\" }\n```\n\nThe setting is stored verbatim, interpolated into the LESS source on the next CSS compile, and the target file's contents appear in `/assets/forum.css`.\n\n## Patches\n\n- **`flarum/core` 1.8.16** — fix for the 1.x branch.\n- **`flarum/core` 2.0.0-rc.1** — fix for the 2.x branch.\n\nThe fix extends the existing `@import` / `data-uri()` validation in `Flarum\\Forum\\ValidateCustomLess::whenSettingsSaving` to every dirty setting whose key is registered as a LESS config variable, not just `custom_less`.\n\n## Workarounds\n\nIf upgrading is not immediately possible:\n\n- Ensure administrator accounts are protected with strong, unique passwords and (where supported) two-factor authentication.\n- Restrict administrator access to trusted users only.\n- Review the forum's public `forum.css` for unexpected content that could indicate prior exploitation.\n\nThere is no configuration-level mitigation on affected versions — the fix requires the upgraded code.\n\n## Resources\n\n- [CVE-2023-27577](https://nvd.nist.gov/vuln/detail/CVE-2023-27577) — the original vulnerability whose patch was incomplete.\n- [GHSA-vhm8-wwrf-3gcw](https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw) — the original advisory.\n\n## Credit\n\nReported to the Flarum Foundation by **William (Liam) Snow IV** ([@LiamSnow](https://github.com/LiamSnow)), discovered during a graduate-level network security lab at Worcester Polytechnic Institute.",
9+
"severity": [
10+
{
11+
"type": "CVSS_V3",
12+
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N"
13+
}
14+
],
15+
"affected": [
16+
{
17+
"package": {
18+
"ecosystem": "Packagist",
19+
"name": "flarum/core"
20+
},
21+
"ranges": [
22+
{
23+
"type": "ECOSYSTEM",
24+
"events": [
25+
{
26+
"introduced": "0"
27+
},
28+
{
29+
"fixed": "1.8.16"
30+
}
31+
]
32+
}
33+
],
34+
"database_specific": {
35+
"last_known_affected_version_range": "<= 1.8.15"
36+
}
37+
},
38+
{
39+
"package": {
40+
"ecosystem": "Packagist",
41+
"name": "flarum/core"
42+
},
43+
"ranges": [
44+
{
45+
"type": "ECOSYSTEM",
46+
"events": [
47+
{
48+
"introduced": "2.0.0-beta.1"
49+
},
50+
{
51+
"fixed": "2.0.0-rc.1"
52+
}
53+
]
54+
}
55+
],
56+
"database_specific": {
57+
"last_known_affected_version_range": "<= 2.0.0-beta.8"
58+
}
59+
}
60+
],
61+
"references": [
62+
{
63+
"type": "WEB",
64+
"url": "https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw"
65+
},
66+
{
67+
"type": "WEB",
68+
"url": "https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878"
69+
},
70+
{
71+
"type": "ADVISORY",
72+
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27577"
73+
},
74+
{
75+
"type": "WEB",
76+
"url": "https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410"
77+
},
78+
{
79+
"type": "PACKAGE",
80+
"url": "https://github.com/flarum/framework"
81+
},
82+
{
83+
"type": "WEB",
84+
"url": "https://github.com/flarum/framework/releases/tag/v1.8.16"
85+
},
86+
{
87+
"type": "WEB",
88+
"url": "https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1"
89+
}
90+
],
91+
"database_specific": {
92+
"cwe_ids": [
93+
"CWE-22",
94+
"CWE-918"
95+
],
96+
"severity": "MODERATE",
97+
"github_reviewed": true,
98+
"github_reviewed_at": "2026-04-22T20:34:52Z",
99+
"nvd_published_at": null
100+
}
101+
}

0 commit comments

Comments
 (0)