Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 1.25.13, 1.26.6, 1.27.0-rc.3, 0.55.0
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- net/http
fixed in 1.25.13; From 1.26.0-0 · fixed in 1.26.6; From 1.27.0-0 · fixed in 1.27.0-rc.3
- net/http/internal/http2
fixed in 1.25.13; From 1.26.0-0 · fixed in 1.26.6; From 1.27.0-0 · fixed in 1.27.0-rc.3
- golang.org/x/net/idna
fixed in 0.55.0
- stdlibGo
fixed in 1.25.13; From 1.26.0-0 · fixed in 1.26.6; From 1.27.0-0 · fixed in 1.27.0-rc.3
- golang.org/x/netGo
fixed in 0.55.0