PT-2021-23433 · Telegram · Telegram

Ne555 · Published 2021-10-04 · Updated 2021-10-10 · CVE-2021-41861

Positive Technologies (AI Summary)

CVSS v3.1

3.3

Low

Base vector

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

Name of the Vulnerable Software and Affected Versions Telegram versions 7.5.0 through 7.8.0

Description The issue concerns the improper implementation of the image self-destruction feature. After using the self-destruct feature several times, the UI may incorrectly indicate that an image has been deleted, when in fact the image remains present on the device in the /Storage/Emulated/0/Telegram/Telegram Image/ directory. This affects both the sender and recipient sides in private and group chats.

Recommendations For versions 7.5.0 through 7.8.0, as a temporary workaround, consider manually checking the /Storage/Emulated/0/Telegram/Telegram Image/ directory for remaining images after using the self-destruct feature. Restrict access to this directory to minimize the risk of unauthorized image access until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2021-41861

Affected Products

Telegram

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2021-41861 · Security Note
• https://desktop.telegram.org/changelog#v-2-6-23-02-21 · Vendor Advisory
• https://telegram.org/blog/autodelete-inv2/ru#avtomaticheskoe-udalenie-soobschenii · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-41861 · Vendor Advisory
• https://t.me/cvenotify/22174 · Telegram Post
• https://t.me/thebugbountyhunter/5706 · Telegram Post
• https://habr.com/ru/post/580582 · Note
• https://pikabu.ru/story/konfidentsialnost_polzovateley_telegram_snova_narushena_predstaviteli_messendzhera_trebuyut_ne_raskryivat_podrobnostey_8511495 · Note